Definition: the part of a seat that you lean against when you are sitting Level: C2
她把头靠在椅背上。
She rested her head on the ___back of the chair.
沙发的靠背也划伤了。
The ___back of the sofa is scratched, too.
这个靠背的人体工学设计提供了出色的腰部支撑。
The ergonomic design of the ___back provides excellent lumbar support.
