ascertained
柯林斯詞典
1. V-T If you ascertain the truth about something, you find out what it is, especially by making a deliberate effort to do so. (尤指經(jīng)過努力) 查明[正式]
Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading. 通過這樣做，老師將能確定這個孩子對他正在讀的內容的理解程度。
Once they had ascertained that he was not a spy, they agreed to release him. 一查明他不是間諜，他們就同意了釋放他。
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