noun🔗Share椅背, 靠背。 The back piece of a chair, used to support the sitter's back."The armchair had a comfortable backrest, perfect for relaxing after a long day at work. "这把扶手椅有个舒适的靠背，非常适合在一天工作后放松身心。partitembuildingarchitectureutilitywearChat with AIVocabulary GamePractice Reading
noun🔗Share中心架 A guide attached to the slide rest of a lathe, and placed in contact with the work to steady it in turning."The machinist carefully adjusted the backrest on the lathe to prevent the long, thin metal rod from vibrating during the turning process. "车工小心地调整了车床上的中心架，以防止细长的金属杆在车削过程中发生振动。technicalmachineworkdeviceChat with AIVocabulary GamePractice Reading
