他们因饥饿而变得虚弱。

They grew weak from hunger.

这棵植物因为缺水而变得虚弱。

The plant has become weak due to lack of water.

献血会使人变得虚弱。

People get weak when they give blood.

由于病的加重使他变得虚弱了。

He weakened as the illness grew worse.

他姑姑因太多焦虑而变得虚弱了。

Too much anxiety has weakened his ant's system.

很快，他开始头晕目眩，变得虚弱起来。

Soon he became dizzy and faint.

他的体力在下降，或者说他正在变得虚弱。

His power is failing. That is to say he is becoming weak.

严寒夺走了他的力量，使他变得虚弱而呆板。

The cold had robbed him of that strength and left him stiff and weak.

最终，它们的前肢变成了鳍状肢，而它们的后肢变得虚弱和多余。

Eventually, their front limbs became flippers and their hind limbs became weak and unnecessary.

他说了这样一句意思双关的俏皮话：“七天没有水使人变得虚弱了。”

He made the following pun:7 days without water made one weak.