ascertain
/ˌæsəˈteɪn; ˌæsɚ`ten/ v[Tn, Tf, Tw]
(fml 文) discover (sth) so that one is certain; get to know 查明; 弄清; 确定
ascertain the true facts 查明事实真相
ascertain that the report is accurate 弄清报告准确无误
ascertain who is likely to come to the meeting 确定谁有可能来开会
The police are trying to ascertain what really happened. 警方正设法查个水落石出.