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短语 up to 1 意思是了解事情发展的最新情况, 它也可以指一个人能够胜任某事。
例句
brian wasn't very good at using the 7 to begin with, but now he's up to speed. he just needed to practise.
请注意
不要同短语 speed up 搞混,speed up 的意思是提速,加快。
例句
mike, speed up a 8 please! we need to finish this today.
点击收听单词发音
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