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在生词簿每个单词后面，加上两个按钮，熟悉与不熟悉:
1.如果点熟悉，就将生词簿中该单词后面记录的添加次数减一，直至减为0，就将该单词从生词簿中移除。
2.如果点不熟悉，就将生词簿中该单词后面记录的添加次数加一。