(pos:動詞)
<explanation>
yue:幫人或者組織做嘢
eng:to render a service to; to serve
<eg>
yue:呢個守門員已經為南華效力十年。 (ni1 go3 sau2 mun4 jyun4 ji5 ging1 wai6 naam4 waa2 haau6 lik6 sap6 nin4.)
eng:This goalie has been serving South China AA for ten years.
<eg>
yue:我會努力為球隊效力。 (ngo5 wui5 nou5 lik6 wai6 kau4 deoi2 haau6 lik6.)
eng:I will try my best to render a service to our football team.
<eg>
yue:老闆高薪聘請我哋為公司效力。 (lou5 baan2 gou1 san1 ping3 cing2 ngo5 dei6 wai6 gung1 si1 haau6 lik6.)
eng:Our boss employs us with high salaries to serve the company.

(pos:名詞)
<explanation>
yue:有效嘅程度
eng:effect; effectiveness; efficacy
<eg>
yue:呢兩份合同具有同等法律效力。 (ni1 loeng5 fan6 hap6 tung4 geoi6 jau5 tung4 dang2 faat3 leot6 haau6 lik6.)
eng:These two contracts have the same legal effect.
<eg>
yue:呢隻藥嘅效力比較低。 (ni1 zek3 joek6 ge3 haau6 lik6 bei2 gaau3 dai1.)
eng:This medicine has a lower efficacy.