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回想一下,再看答案

记忆卡片

先回想学过的内容,再查看解释,然后选择下次复习的时间。

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B1

Back up

先写下记得的内容,再查看解释。不要填写个人信息。

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查看解释

The phrasal verb back up carries five primary meanings in everyday English: supporting someone who needs help, providing evidence that reinforces a statement, creating a duplicate copy of data, moving in reverse, and accumulating in a queue when forward movement is blocked.

My colleague offered to back me up during the budget review.
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