不要浪费粮食，能吃多少拿多少。

bù yào làngfèi liángshí, néng chī duōshǎo ná duōshǎo.

Don't waste food; take only as much as you can eat.

在这件事上浪费时间真的不值得。

zài zhè jiàn shì shàng làngfèi shíjiān zhēn de bù zhídé.

It's really not worth wasting time on this matter.

他觉得花两个小时排队太浪费了。

tā juédé huā liǎng gè xiǎoshí páiduì tài làngfèi le.

He felt that spending two hours waiting in line was too wasteful.