- know how the matter stands br>feel sure of sth. base number br>radix br>base br>
- 心中: at heart; in mind
- 有底: know how things stand and fe ...
- 数: frequently; repeatedly
- 心中有底: have someone’s number
- 心中有鬼: have ulterior motives; have a bellyful of tricks; have sth. to hide
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