腰垫

例句：

1. 1. The office chair has a comfortable backrest for your comfort.
   这款办公椅有舒适的靠背，让你坐得舒服。
2. 2. She sat on the couch with her backrest against the wall.
   她坐在沙发上，靠背靠在墙上。
3. 3. The new car comes with a supportive rear suspension system.
   新款汽车配备了一个支持性的后悬挂系统。