Fork Backrest双叉靠背
backrest bushing靠背轴套
adjustable backrest可调式靠背
backrest block后立柱移动块
backrest knob靠背调整旋钮
Foldable Backrest靠背可
High Backrest高靠背
Backrest locking靠背锁
Backrest design腰垫设计
N-COUNT（可数名词） The backrest of a seat or chair is the part that you rest your back on. 靠背