I don't know what they'll want when they arrive—we'll have to play it by ear.

我不知道他们到达时需要什么—我们只有见机行事了。

No problem. I'll play it by ear.

没问题。我会即兴发挥的。

Let's play it by ear, okay?

玩耳朵？

Let's play it by ear.

让我们凭听觉记忆演奏。

Our last expression is to play it by ear.

我们最后一个表达式是随机应变。 这有两层含义。