17.play it by ear到时候再决定

A: Let's go to the movies, agreed? 

咱们去看电影啊，怎么样？

B: Sure. And what'll we do after that? 

行啊，那看完电影还干嘛？

A: Oh, I don't know. Let's play it by ear. 

哦，不知道呀。到时候再说吧。

B: Well, I would like to have a more definite plan of action. 

哎呀，我想要一个更明确的计划。

A: Don't be like that. It's always more fun not knowing what to expect and deciding what to do as we go along. 

别这样。对未知的期待和随性决定干嘛会更好玩儿。