vt. 1.确定，查明，弄清。 2.〔罕用语〕确定，把…弄实在。 短语和例子 ascertain what really happened 查明究竟发生了什么事。 adj. -able 可确定的；可查明的。 n. -ment 确定；查明；探知。
be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product" 同义词：see, check, insure, see to it, ensure, control, assure,
learn or discover with certainty
establish after a calculation, investigation, experiment, survey, or study; "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize" 同义词：determine, find, find out,
find out, learn, or determine with certainty, usually by making an inquiry or other effort; "I want to see whether she speaks French"; "See whether it works"; "find out if he speaks Russian"; "Check whether the train leaves on time" 同义词：determine, check, find out, see, watch, learn,
例句与用法
1.
It 's difficult to ascertain the coal deposits ... 煤储量很难探明。
2.
I'll endeavor to ascertain her mind . 我得先努力弄清楚她的想法。
3.
We have written to christminster to ascertain . 我们已经写信到基督寺问过了。
4.
An autopsy was needed to ascertain the cause of his death . 需验尸方能确定他的死因。
5.
They are doing everything possible to ascertain his whereabouts . 他们正在尽力调查他的下落。
6.
It has been difficult to ascertain the correct source of origin . 要查实材料的正确起源很困难。
7.
It is difficult to ascertain the exact duration of protection . 要弄清确切的予防有效期并不容易。
8.
We must ascertain the responsibility in light of different situations . 我们必须根据不同情况判定责任。
9.
The court must therefore ascertain the "proper law" of the contract . 因此，法院务必查明该契约的“准据法”。
10.
The pathway of ddt degradation in soil has not been fully ascertained . 在土壤中滴滴涕降解的途径还没有充分调查。
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