diff --git a/app/Article.py b/app/Article.py
index 774d25a..b73e5e2 100644
--- a/app/Article.py
+++ b/app/Article.py
@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 from WordFreq import WordFreq
 from wordfreqCMD import youdao_link, sort_in_descending_order
 from UseSqlite import InsertQuery, RecordQuery
diff --git a/app/Article.pyc b/app/Article.pyc
new file mode 100644
index 0000000..09bd142
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diff --git a/app/Login.py b/app/Login.py
index 65047f7..9651339 100644
--- a/app/Login.py
+++ b/app/Login.py
@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 import hashlib
 from datetime import datetime
 from UseSqlite import InsertQuery, RecordQuery
diff --git a/app/Login.pyc b/app/Login.pyc
new file mode 100644
index 0000000..f245111
Binary files /dev/null and b/app/Login.pyc differ
diff --git a/app/UseSqlite.pyc b/app/UseSqlite.pyc
new file mode 100644
index 0000000..1fe9f67
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diff --git a/app/WordFreq.pyc b/app/WordFreq.pyc
new file mode 100644
index 0000000..edc768f
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diff --git a/app/Yaml.py b/app/Yaml.py
index 00974aa..7f6d992 100644
--- a/app/Yaml.py
+++ b/app/Yaml.py
@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 '''
 Yaml.py
 配置文件包括:
diff --git a/app/Yaml.pyc b/app/Yaml.pyc
new file mode 100644
index 0000000..9d104e8
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diff --git a/app/difficulty.py b/app/difficulty.py
index 50aa179..7d1b7bf 100644
--- a/app/difficulty.py
+++ b/app/difficulty.py
@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 ###########################################################################
 # Copyright 2019 (C) Hui Lan <hui.lan@cantab.net>
 # Written permission must be obtained from the author for commercial uses.
diff --git a/app/difficulty.pyc b/app/difficulty.pyc
new file mode 100644
index 0000000..2caee6b
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diff --git a/app/pickle_idea.pyc b/app/pickle_idea.pyc
new file mode 100644
index 0000000..7a17cf9
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diff --git a/app/pickle_idea2.py b/app/pickle_idea2.py
index 4055fc4..0da55bc 100644
--- a/app/pickle_idea2.py
+++ b/app/pickle_idea2.py
@@ -68,7 +68,7 @@ def save_frequency_to_pickle(d, pickle_fname):
     d2 = {}
     for k in d:
         if not k in exclusion_lst and not k.isnumeric() and not len(k) < 2:
-            d2[k] = list(sorted(set(d[k])))
+            d2[k] = list(sorted(d[k])) # 原先这里是d2[k] = list(sorted(set(d[k])))
     pickle.dump(d2, f)
     f.close()
 
diff --git a/app/pickle_idea2.pyc b/app/pickle_idea2.pyc
new file mode 100644
index 0000000..0db1de0
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diff --git a/app/wordfreqCMD.py b/app/wordfreqCMD.py
index 9ee7e56..313fd6f 100644
--- a/app/wordfreqCMD.py
+++ b/app/wordfreqCMD.py
@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 ###########################################################################
 # Copyright 2019 (C) Hui Lan <hui.lan@cantab.net>
 # Written permission must be obtained from the author for commercial uses.
diff --git a/app/wordfreqCMD.pyc b/app/wordfreqCMD.pyc
new file mode 100644
index 0000000..f9784fd
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