Parents need to keep an eye on their kids while they are playing.问:为什么用an eye on?

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Parentsneedtokeepaneyeontheirkidswhiletheyareplaying.问:为什么用aneyeon?Parentsneedtokeepaneyeontheirkids

Parents need to keep an eye on their kids while they are playing.问:为什么用an eye on?
Parents need to keep an eye on their kids while they are playing.问:为什么用an eye on?

Parents need to keep an eye on their kids while they are playing.问:为什么用an eye on?
习惯用语,意思是留心,注意.
其实和I need an apple.中的 an apple也有相似的意思,不确定的泛指(可以这么理解),不过把它当固定搭配用是最好的,每种语言都有一些不能用语法解释的词组和说法,这是正常的.