名词
中文翻译：背脊
同义词：
['back', 'spine例句：1. The back ridge of the mountain is covered with snow.（山的背脊被雪覆盖。）2. He sat down on the back ridge of the chair.（他坐在椅子的背脊上。）']
例句：
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1. The back ridge of the mountain is covered with snow.
山的背脊被雪覆盖。
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2. He sat down on the back ridge of the chair.
他坐在椅子的背脊上。
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3.The back ridge of the book is written in large letters.
书的背脊用大号字体写。