lassitude in loin and legs

例句：

1. 1.The patient lay in bed, feeling a sense of lassitude.
   病人躺在床上，感到一种无力感。
2. 2. His lack of motivation left him feeling listless and unmotivated.
   他的缺乏动力使他感到无力和无动力。
3. 3. The weather had a profound effect on the people's mood, causing some to feel lassitude.
   天气对人们的情绪产生了深远的影响，导致一些人感到无力。