you (informal, as opposed to courteous 您nín [您])
can be used to refer to an unspecified person
eye
small hole
crux (of a matter) M: 只zhī [只]
双shuāng [双]
classifier for big hollow things (wells, stoves, pots etc) or needle, nail, lamp etc
eyelet
opening
aperture
salient point
insight
trap (in chess)
unaccented beat (in opera)
eyesight