When one stitch frays, the fabric is weakened.

一个针脚破了，布料的强度就会减弱。

youdao

Their enemy is weakened and a weakened enemy is a good target.

“这些亲俄分子的政敌已经很弱了，所以这个弱敌是个很好的目标”。

youdao

When someone's immune system is weakened, the chances of becoming sick are greater.

当一个人的免疫系统被削弱，患病的机会就比较大。

youdao

It is a live vaccine, made of a weakened version of the whole malaria parasite.

VOA: special.2010.04.20

So this could be summarized as the law of effect, which is a tendency to perform an action's increased if rewarded, weakened if it's not.

这种行为上的变化被称之为效果律，也就是说，行为倾向随奖励而增加，随惩罚而减少。

耶鲁公开课 - 心理学导论课程节选

The voice,believed to be that of Bin Laden, thus concludes President Obama is a weakened man and powerless to change course in Afghanistan because of "pressure groups."

VOA: standard.2009.09.14

For one, if the dollar is weakened, dollar costs for U.S. exporters will necessarily rise.

FORBES: To Mount a Comeback, Obama Must Ignore Simon Johnson

The considerable spell the movie casts is weakened by its length and sometimes scattershot approach.

WSJ: Film Review

Mr Clinton himself is weakened even more than would be normal at the end of a second term.

ECONOMIST: America��s world