knee bolster

例句：

1. 1.He sat on the couch with his knees bent, trying to rest his aching feet.
   他坐在沙发上，膝盖弯曲着，试图放松他的酸痛的脚。
2. 2.She propped up her laptop with a knee bolster while she worked on her report.
   她在写报告时用膝盖垫支撑着她的笔记本电脑。
3. 3. The old man leaned against the wall with his knees touching, as if he was seeking comfort.
   老人靠在墙上，膝盖碰在一起，好像在寻求安慰。