私欲

mǎn zú sī yù

满足私欲

gratify one's selfish desire

tān tú sī yù

贪图私欲

avidly seek to satisfy selfish, carnal desires

tā men shì wèi le sī yù kuò dà zì jǐ de zhèng zhì shì lì

他们是为了私欲，扩大自己的政治势力。

They were in fact stealing time to selfishly expand their own political strength.