make certain

弄清楚, 确定

例句与用法：

Make certain of your position in the firm before you argue with the director.

你在和经理争辩之前，要首先弄清你在公司里的地位。

The authors wish you to read it with a pencil in your hand, for you will often be asked to make certain notations, to write answers to particular questions.

作者们希望你在读这本书的时候手里要拿上一支铅笔，因为我们要求你经常做点笔记，或是将一些具体问题的答案写下来。

You'd better leave now if you want to make certain of getting there on time.

你要想准时到达那里就最好马上走。

She shook it to make certain there was nothing inside.

她把它摇了摇，想知道里面确实没有东西。

详细释义：

确定

Please make certain when the train leaves.

请确定火车什么时候开。