英语博客-北美风情 96、To brush up on something（在线收听）

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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.