This dusty knowledge needs brushing up after the passage of years.
经过这些年以后，这种陈旧的知识需要温习一番。
If you're brushing up on the classics and a newly published novel catches your eye, read it!
如果有一本书抓住了你的眼球，就去读吧！
She spent the summer brushing up on her American History as she was to teach that in the fall.
她利用夏天温习了美国历史，因为她秋季要讲授那门课程。
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