名词
中文翻译：拱背
同义词：
['arch', 'backrest', 'backbone']
例句：
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1.The back of the chair is designed to support your back.
椅子的背部设计来支撑你的背部。
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2. The back of the book is covered in maps and diagrams.
这本书的背面有地图和图表。
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3. The back of the room was filled with laughter and chatter.
房间里充满了笑声和闲聊声。