know what is what ; know one's beans
... keep (the) score (在比赛中)记分数 know the score (=know what the score is) 知道事情的真相; 精明老练 level the score 把比分拉平, 打平 ...
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它们对于哪种媒介（从信息和接收者考虑）是最合适的，是晚餐邀请还是约会邀约，显得十分精明老练。
They are very savvy in understanding which medium is most appropriate for the message and for the recipient, whether it’s a dinner invitation or asking someone out on a date.
youdao
精明老练是一个汉语成语，意思是机敏聪明，老成稳重。
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