膝

例句：

1. 1. She sat on the couch with her knees drawn up to her chest.
   她坐在沙发上，膝盖紧贴胸部。
2. 2. He limped as he walked with his injured knee.
   他走路时一瘸一拐，因为膝盖受伤了。
3. 3. The dancer performed a routine that involved bending and straightening her knees.
   舞者表演了一个涉及弯曲和伸直膝盖的舞蹈动作。