名 eye，small hole，aperture，key point；

[例句] 我在飞机上没合一下眼。 I didn't get a wink of sleep on the aeroplane.

[例句] 她抬眼迅速瞥了他一下，然后眼睛又垂了下去。 She gave him a quick, upward look, then lowered her eyes.