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Weak，Feeble，Fragile，Frail
虚弱的。
🚩weak含义比较广泛，它可以指“身体虚弱无力的”，柯林斯解释为If someone is weak, they are not healthy or do not have good muscles, so that they cannot move quickly or carry heavy things.。
如：
I was too weak to move or think or speak.我太虚弱了，无法动弹，无法思考，也无法说话。
His arms and legs were weak.他的四肢虚弱无力。
🚩weak还可以指“意志薄弱的，懦弱的”，柯林斯解释为If you describe someone as weak, you mean that they are not very confident or determined, so that they are often frightened or worried, or easily influenced by other people.。
如：
He was a nice doctor, but a weak man who wasn't going to stick his neck out.他是位为人和蔼的医生，但胆小怕事，不敢冒什么风险。
You have been conditioned to believe that it is weak to be scared.你已经习惯性地认为害怕就是软弱。
🚩weak还可以指“身体某器官或者感官功能差的，受损伤的”，柯林斯解释为If someone has an organ or sense that is weak, it is not very effective or powerful, or is likely to fail.。
如：
Until the beating, Cantanco's eyesight had been weak, but adequate.挨打前坎坦科的视力就一直很弱，不过也还勉强看得见。
She tired easily and had a weak heart.她很容易疲劳，心脏也不好。
🚩feeble是“虚弱的，微弱的，无力的”，它主要用来“形容人及其行为或言词，表示体力、智力或道德方面明显缺乏或者虚弱；有时候形容事物，表示微弱或者不足”，柯林斯解释为If you describe someone or something as feeble, you mean that they are weak.。feeble与weak的区别在于，feeble含有一种贬义，是“软弱的，懦弱的，暗示这个人可能是令人怜悯或者被人看不起”，柯林斯解释为If you describe someone as feeble, you are criticizing them because they are afraid of taking strong action or seem to make no effort.。
如：
He told them he was old and feeble and was not able to walk so far...他告诉他们，他年老体弱，不能走那么远。
the feeble light of a tin lamp.锡灯微弱的光线
He said that the Government had been feeble.他说政府很懦弱。
🚩fragile主要是“易碎的，易坏的”，它也有“虚弱的，无力的”意思，暗含的意思是“这个人容易生病，容易变得虚弱，容易受到伤害”。柯林斯解释为If someone feels fragile, they feel weak, for example because they are ill or have drunk too much alcohol.。
如：
He felt irritated and strangely fragile, as if he were recovering from a severe bout of flu.他感到恼火和莫名其妙的虚弱，仿佛经历了一场重感冒，正在康复。
frail是“虚弱的，体弱的”，它与fragile同义，可以互换使用。但是frail在指身体虚弱的时候，更强调天生脆弱的性质而不强调外因造成体力受损；形容精神力量时候，比weak更强调缺乏抵御的能力。柯林斯解释为Someone who is frail is not very strong or healthy.，或者Something that is frail is easily broken or damaged.。
如：
She lay in bed looking particularly frail.她躺在床上，看上去特别虚弱。
The frail craft rocked as he clambered in.他爬进来的时候，那件易碎的工艺品摇晃起来。
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