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。

Neil sat at the piano and began playing, by ear, the music he'd heard his older sister practising.

尼尔坐在钢琴边，凭着记忆开始演奏曾听他姐姐练习过的曲子。

Let's play it by ear, okay?

玩耳朵？

I want to play piano by ear.

因为我想用耳朵弹琴。

No problem. I'll play it by ear.

没问题。我会即兴发挥的。