hǎo​shǐ

effective

好使 hǎo​shǐ
effective adjective
easy to use or functioning well

剪刀好使

zhè jiǎn​dāo zhēn hǎo​shǐ.

This pair of scissors is really easy to use.

so that verb
in order to or so as to

I'll leave an address so that you can contact me later.

Frequency

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

Sources

Definitions
CC-CEDICT