習慣用語,意思是留心,注意.
其實和I need an apple.中的 an apple也有相似的意思,不確定的泛指（可以這么理解）,不過把它當固定搭配用是最好的,每種語言都有一些不能用語法解釋的詞組和說法,這是正常的.
Parents need to keep an eye on their kids while they are playing.問：為什么用an eye on?
Parents need to keep an eye on their kids while they are playing.問：為什么用an eye on?
英語人氣：798 ℃時間：2020-06-07 20:18:18
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