present tense | |
I/you/we/they | brush up |
he/she/it | brushes up |
present participle | brushing up |
past tense | brushed up |
past participle | brushed up |
I took a class to brush up my German before the trip. 我在旅行前去听课来提高我的德语水平。
the opportunity to brush up on various techniques 提高各种技能的机会
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