英語博客-北美風(fēng)情 96、To brush up on something

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　　You might be checking out this Culips episode because you are brushing up on your English! In this episode we look at three expressions that mean exactly the same thing: to brush up on, to bone up on, to polish up on. These expressions are good to know if you are studying something you already know or refreshing some of your old skills.