[ 复数 backrests ]
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同义词： back
以上来源于: WordNet
N-COUNT The backrest of a seat or chair is the part that you rest your back on. 靠背
Free standing backrests support you in a sitting position.
自由站立靠背坐姿支持你。
youdao
It said that an increase of two inches in the minimum gap between backrests was needed for people to escape easily in the event of an emergency.
BBC: Civil Aviation Authority report
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