noun 下载 🔗分享 椅背, 靠背。 The back piece of a chair, used to support the sitter's back. Examples : "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。 part item building architecture utility wear 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 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. Examples : "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。 technical machine work device 与AI对话词汇游戏阅读练习