第三人称复数：backrests
1. 靠背护垫：靠背护垫(Backrest) Backrest-靠背护垫, 不同年龄不一样的护垫, 专为儿童设计的. 儿童护垫(Child Cushion)
2. 靠背：靠岸缆索checkline | 靠背backrest | 靠背板backboard
3. 座椅靠背：backlash eliminator 齿隙消除装置 | backrest 座椅靠背 | backstop 后退定程挡块
4. 腰垫：15.lifter升降杆 | 16.backrest腰垫 | 17.seat座位
1. （坐椅的）靠背
The backrest of a seat or chair is the part which you rest your back on.
noun
1. a support that you can lean against while sitting
e.g. the back of the dental chair was adjustable
Synonym: back