四肢无力的

例句：

1. 1. He was so tired that he could barely walk.
   他太累了，几乎走不动了。
2. 2. The old man's legs were so weak that he couldn't stand up.
   老人的腿很虚弱，以至于他站不起来。
3. 3. The baby was born with a condition that left him feeling feeble.
   婴儿出生时患有一种病，让他感觉非常虚弱。