yào hài
vital part
(fig.) key point
crucial
zhèng zhōng yào hài
to hit the nail on the head (idiom)
qiè zhòng yào hài
to hit the target and do real damage (idiom)
fig. to hit where it hurts
fig. to hit home
an argument that hits the nail on the head
zhèng zhòng yào hài
to hit the nail on the head (idiom)