每日英语俚语128: 了如指掌 (mp3和文本下载)
2017-03-23来源:和谐英语
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at one's fingers' tips
了如指掌
It is at my fingers' tips. I think I can give you all the information right now.
这事我了如指掌，现在我就可以将全部情况告诉你。
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