early 15c., "to inform, to give assurance," from Anglo-French acerteiner, Old French acertener "to assure, certify" (13c.), from a "to" (see ad-) + certain "certain" (see certain). Modern meaning of "find out for sure by experiment or investigation" is first attested 1794. Related: Ascertained; ascertaining.
权威例句
1. It can be difficult to ascertain the facts.
可能难以查明事实真相。
2. I'm going to ascertain the truth.
我要查明真相.
3. It's difficult to ascertain the coal deposits.
煤储量很难探明.
4. The police determined to ascertain the truth of the matter.
ascertain:警察决心查明事实的真相.
5. Take time to ascertain what services your bank is providing, and at what cost.