diff --git a/app/Article.py b/app/Article.py
index 35a06a4..e40717f 100644
--- a/app/Article.py
+++ b/app/Article.py
@@ -32,20 +32,20 @@ def get_article_body(s):
     return '\n'.join(lst)
 
 
-def get_today_article(user_word_list, had_read_articles):
+def get_today_article(user_word_list, visited_articles):
     rq = RecordQuery(path_prefix + 'static/wordfreqapp.db')
-    if had_read_articles is None:
-        had_read_articles = {
+    if visited_articles is None:
+        visited_articles = {
             "index" : 0,  # 为 article_ids 的索引
             "article_ids": []  # 之前显示文章的id列表，越后越新
         }
-    if had_read_articles["index"] > len(had_read_articles["article_ids"])-1:  # 生成新的文章，因此查找所有的文章
+    if visited_articles["index"] > len(visited_articles["article_ids"])-1:  # 生成新的文章，因此查找所有的文章
         rq.instructions("SELECT * FROM article")
     else:  # 生成阅读过的文章，因此查询指定 article_id 的文章
-        if had_read_articles["article_ids"][had_read_articles["index"]] == 'null':  # 可能因为直接刷新页面导致直接去查询了'null'，因此当刷新的页面的时候，需要直接进行“上一篇”操作
-            had_read_articles["index"] -= 1
-            had_read_articles["article_ids"].pop()
-        rq.instructions('SELECT * FROM article WHERE article_id=%d' % (had_read_articles["article_ids"][had_read_articles["index"]]))
+        if visited_articles["article_ids"][visited_articles["index"]] == 'null':  # 可能因为直接刷新页面导致直接去查询了'null'，因此当刷新的页面的时候，需要直接进行“上一篇”操作
+            visited_articles["index"] -= 1
+            visited_articles["article_ids"].pop()
+        rq.instructions('SELECT * FROM article WHERE article_id=%d' % (visited_articles["article_ids"][visited_articles["index"]]))
     rq.do()
     result = rq.get_results()
     random.shuffle(result)
@@ -60,25 +60,25 @@ def get_today_article(user_word_list, had_read_articles):
     d_user = load_freq_history(user_word_list)
     user_level = user_difficulty_level(d_user, d3)  # more consideration as user's behaviour is dynamic. Time factor should be considered.
     text_level = 0
-    if had_read_articles["index"] > len(had_read_articles["article_ids"])-1:  # 生成新的文章
-        amount_of_had_read_articles = len(had_read_articles["article_ids"])
+    if visited_articles["index"] > len(visited_articles["article_ids"])-1:  # 生成新的文章
+        amount_of_visited_articles = len(visited_articles["article_ids"])
         amount_of_existing_articles = result.__len__()
-        if amount_of_had_read_articles == amount_of_existing_articles:  # 如果当前阅读过的文章的数量 == 存在的文章的数量，即所有的书本都阅读过了
+        if amount_of_visited_articles == amount_of_existing_articles:  # 如果当前阅读过的文章的数量 == 存在的文章的数量，即所有的书本都阅读过了
             result_of_generate_article = "had read all articles"
         else:
             for k in range(3):  # 最多尝试3次
                 for reading in result:
                     text_level = text_difficulty_level(reading['text'], d3)
                     factor = random.gauss(0.8, 0.1)  # a number drawn from Gaussian distribution with a mean of 0.8 and a stand deviation of 1
-                    if reading['article_id'] not in had_read_articles["article_ids"] and within_range(text_level, user_level, (8.0 - user_level) * factor):  # 新的文章之前没有出现过且符合一定范围的水平
+                    if reading['article_id'] not in visited_articles["article_ids"] and within_range(text_level, user_level, (8.0 - user_level) * factor):  # 新的文章之前没有出现过且符合一定范围的水平
                         d = reading
-                        had_read_articles["article_ids"].append(d['article_id'])  # 列表添加新的文章id；下面进行
+                        visited_articles["article_ids"].append(d['article_id'])  # 列表添加新的文章id；下面进行
                         result_of_generate_article = "found"
                         break
                 if result_of_generate_article == "found":  # 用于成功找到文章后及时退出外层循环
                     break
         if result_of_generate_article != "found":  # 阅读完所有文章，或者循环3次没有找到适合的文章，则放入空（“null”）
-            had_read_articles["article_ids"].append('null')
+            visited_articles["article_ids"].append('null')
     else:  # 生成已经阅读过的文章
         d = random.choice(result)
         text_level = text_difficulty_level(d['text'], d3)
@@ -97,7 +97,7 @@ def get_today_article(user_word_list, had_read_articles):
             "answer": get_answer_part(d['question'])
         }
 
-    return had_read_articles, today_article, result_of_generate_article
+    return visited_articles, today_article, result_of_generate_article
 
 
 def load_freq_history(path):
diff --git a/app/account_service.py b/app/account_service.py
index 8de9a03..a7ed0c4 100644
--- a/app/account_service.py
+++ b/app/account_service.py
@@ -37,7 +37,7 @@ def signup():
                 session[username] = username
                 session['username'] = username
                 session['expiry_date'] = get_expiry_date(username)
-                session['had_read_articles'] = None
+                session['visited_articles'] = None
                 return jsonify({'status': '2'})
             else:
                 return jsonify({'status': '1'})
@@ -66,7 +66,7 @@ def login():
             session['username'] = username
             user_expiry_date = get_expiry_date(username)
             session['expiry_date'] = user_expiry_date
-            session['had_read_articles'] = None
+            session['visited_articles'] = None
             return jsonify({'status': '1'})
         else:
             return jsonify({'status': '0'})
diff --git a/app/templates/userpage_get.html b/app/templates/userpage_get.html
index cb892db..8620b19 100644
--- a/app/templates/userpage_get.html
+++ b/app/templates/userpage_get.html
@@ -47,7 +47,7 @@
     {% if result_of_generate_article != "had read all articles" %}
         <a id="next_btn" class="btn btn-success" href="/{{ username }}/reset" role="button"> 下一篇 Next Article </a>
     {% endif %}
-    {% if session.get('had_read_articles') and session.get('had_read_articles')['index']>0 %}
+    {% if session.get('visited_articles') and session.get('visited_articles')['index']>0 %}
         <a id="pre_btn" class="btn btn-success" href="/{{ username }}/back" role="button"> 上一篇 Previous Article </a>
     {% endif %}
 
diff --git a/app/user_service.py b/app/user_service.py
index 4f81c6e..f514d45 100644
--- a/app/user_service.py
+++ b/app/user_service.py
@@ -30,12 +30,12 @@ def user_reset(username):
     :return: 返回页面内容
     '''
     if request.method == 'GET':
-        had_read_articles = session.get("had_read_articles")
-        if had_read_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来,无需index+=1
-            had_read_articles['article_ids'].pop()
+        visited_articles = session.get("visited_articles")
+        if visited_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来,无需index+=1
+            visited_articles['article_ids'].pop()
         else:  # 当前不为“null”，直接 index+=1
-            had_read_articles["index"] += 1
-        session["had_read_articles"] = had_read_articles
+            visited_articles["index"] += 1
+        session["visited_articles"] = visited_articles
         return redirect(url_for('user_bp.userpage', username=username))
     else:
         return 'Under construction'
@@ -48,11 +48,11 @@ def user_back(username):
     :return: 返回页面内容
     '''
     if request.method == 'GET':
-        had_read_articles = session.get("had_read_articles")
-        had_read_articles["index"] -= 1  # 上一篇，index-=1
-        if had_read_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来
-            had_read_articles['article_ids'].pop()
-        session["had_read_articles"] = had_read_articles
+        visited_articles = session.get("visited_articles")
+        visited_articles["index"] -= 1  # 上一篇，index-=1
+        if visited_articles['article_ids'][-1] == "null":  # 如果当前还是“null”，则将“null”pop出来
+            visited_articles['article_ids'].pop()
+        session["visited_articles"] = visited_articles
         return redirect(url_for('user_bp.userpage', username=username))
 
 
@@ -139,8 +139,8 @@ def userpage(username):
         words = ''
         for x in lst3:
             words += x[0] + ' '
-        had_read_articles, today_article, result_of_generate_article = get_today_article(user_freq_record, session.get('had_read_articles'))
-        session['had_read_articles'] = had_read_articles
+        visited_articles, today_article, result_of_generate_article = get_today_article(user_freq_record, session.get('visited_articles'))
+        session['visited_articles'] = visited_articles
         # 通过 today_article，加载前端的显示页面
         return render_template('userpage_get.html',
                                username=username,