他弄不清楚她是在笑还是在哭。

He couldn't tell if she was laughing or crying.

《牛津词典》

我们一直弄不清楚她为什么辞职。

We never did discover why she gave up her job.

《牛津词典》

他努力了解这个年轻人的动机，但就是弄不清楚。

He tried to get a fix on the young man's motives, but he just couldn't understand him.

《牛津词典》

You can't get what you want you could but it's a good idea to figure out what you want before you try and get what you want.

你无法得到想要的,不,你能,但最好事先弄清楚,就是,汝欲得之,必先知之

耶鲁公开课 - 博弈论课程节选