形容词
中文翻译：向后的
同义词：
['backward', 'backwards', 'back-to-back', 'backwardness']
例句：
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1.The team was so slow that they were almost at the back of the pack.
队伍太慢了，几乎落在最后。
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2.The old man walked slowly, his back turned to the sun.
老人缓慢地走着，背对着太阳。
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3. The children ran back-to-back, laughing and playing happily.
孩子们手拉手跑着，开心地笑着玩耍。