第一步：

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第二步：

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官方说明：
Reset collection - remove all learning data from the collection to make it look as if it has not been used by anyone. File : Tools : Reset collection is useful if you would like to pass your collection to someone who would like to use it too. You can also reset your collection if you would like to distribute it commercially. File : Tools : Reset collection will remove all data related to your learning process, and leave all memorized elements in the pending (or dismissed) state