为什么是look sb in the eye而不是eyes?

为什么是look sb in the eye而不是eyes? 英语问题 look sb in the eye look sb in the eye中eye为什么不加s 英语：look sb in the eye 与 look sb in one's eye 区别 look at my eyes 和 look me in the eye啥区别 hit与介词搭配用法为什么是hit sb on the headhit sb in the eye?如何区分 为什么是with eye open 而不是with eyes opened ,那应该是witheyes close还是 look sb.in the 击中某人的眼睛 英文翻译hit sb. in the eye 为什么要用in? Look!The girl _____(look)good in the new dress.为什么这里looks而不是 怎么翻译look people in the eyes. He smiled at the loving look in my eye