She was born with a weak heart.

她生来就有一个衰弱的心脏。

《牛津词典》

She suffered from a weak heart.

她心脏不好。

《牛津词典》

He was a weak little mouse of a man.

他是个懦弱无能的人。

《牛津词典》

They may have a weak or damaged heart, high blood pressure or other problems of the blood system.

VOA: special.2010.07.27

So I'm going to wave my hands at what one fflush of these things here does, fflush here, but I decided this is kind of a weak implementation.

所以我将向这些东西所做的挥手,这里的，但是我觉得这是个有点无力的实现。

哈佛公开课 - 计算机科学课程节选

All right, so that's a weak argument, but in fact, it's a way of suggesting, probably not.

这是一种提议，可能是错的，好了，那我们对一个列表。

麻省理工公开课 - 计算机科学及编程导论课程节选

They sense their creditors at the EU and the IMF have a weak hand.

BBC: The Greek conundrum

There is but one precedent for a strong prime minister and a weak head of state.

ECONOMIST: Russia's presidency

"A current of moving air moves a weak little old mosquito far and wide, " he said.

CNN: Spring wedding, backyard disaster