hǎo​shǐ

work well

好使 hǎo​shǐ
work well adjective
to function well or be effective (of a device, or metaphorically of a person's mind or memory)

My eyes aren't what they used to be.

easy to use
convenient to use or easy to operate; handy
so that
used to connect two clauses to show purpose, meaning "so as to" or "in order to"

Frequency

Movie subtitles
2.71 per million appears in 1% of films
Written text
2.04 per million

Sources