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TOEFL IELTS BNC: 5989 COCA: 9571

to discover something弄清,确定,查明

The police have so far been unable to ascertain the cause of the explosion.警方到目前为止尚未查明爆炸原因。
[ + question word ] Have you ascertained whether she's coming or not?你问清楚了吗,她来还是不来?

to make certain of something确信

[ + that ] I ascertained that no one could overhear us before I told Otto the news.确信没有人能听到我们的谈话之后,我才把这个消息告诉了奥托。
TOEFL IELTS BNC: 5989 COCA: 9571
TOEFL IELTS BNC: 5989 COCA: 9571
ascertain verb
find3
TOEFL IELTS BNC: 5989 COCA: 9571

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