The long war of attrition exhausted the strength of both countries.

这场长期的消战了两国的力量。

They went on firing until all their ammunition was spent.

他们不断射击, 直到所有的弹药。

The series of steep hills sapped the cyclists’ strength.

一连串坡度很大的小了骑车人的气力。

War often drains a nation's economy.

战争经常一个国家的经济。

"If the natural resources are used economically, we can certainly slow down the present drain on the limited energy supply."

"如果能节约地使用自然资,那么有限能的速度就会放慢。"

Many people live with a tormentor in their head that continuously attacks and punishes them and drains them of vital energy.

许多人在脑袋的折磨下度过一生，饱受有无减的攻击、惩罚，终至生命的能量。

It serves, they say, as a reservoir of beneficial microbes which can recolonize the gut after it's emptied by diseases such as cholera or dysentery.

他们说像一个有益菌的蓄水池那样工作着，当被像霍乱和痢疾之类的疾病之后能够再重新迁移到肠道中去。