haunch of arch

例句：

1. 1.He sat on the couch with his haunch resting on it.
   他坐在沙发上，臀部靠在它上面。
2. 2. The old man's haunch was covered in wrinkles.
   老人的臀部布满了皱纹。
3. 3. She lifted her haunch and stretched her arms.
   她抬起臀部，伸展双臂。