ascertains的中文翻譯是什麼意思

VERB（尤指經過努力後）查明，弄清，確定

If you ascertain the truth about something, you find out what it is, especially by making a deliberate effort to do so.

• Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading...

  這樣一來，老師就能確定孩子們對他所讀的內容理解多少了。

• Once they had ascertained that he was not a spy, they agreed to release him...

  一旦確認他並非間諜，他們即同意將他釋放。