make certain of

• vt. 确定(弄清楚；弄确实)

make certain of的用法和样例：

例句

1. 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。
2. 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。