为 + Entity + 效力
The word 效力 (xiàolì) can mean "to serve" (as a verb) or "effectiveness" (as a noun). When used as a verb, it often describes dedicating one's efforts to a cause, country, or organization, conveying a sense of duty and loyalty.
他决定回国效力,为祖国的发展做贡献。
Tā juédìng huíguó xiàolì, wèi zǔguó de fāzhǎn zuò gòngxiàn.
He decided to return to his country to serve it and contribute to its development.
这种药的效力能持续大约八个小时。
Zhè zhǒng yào de xiàolì néng chíxù dàyuē bā gè xiǎoshí.
The effectiveness of this medicine lasts about eight hours.
她一直想为家乡的教育事业效力。
Tā yīzhí xiǎng wèi jiāxiāng de jiàoyù shìyè xiàolì.
She has always wanted to serve the cause of education in her hometown.