play it by ear

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释义
随机应变
To act according to the circumstances; improvise:

例句
Walt: So are you home for good then?
Hank: No, no. It's Playing it by ear. To be determined.
沃尔特：你回来，就不回去了？
汉克：不，不是。随机应变，待命。（绝命毒师）