名词
中文翻译：后退的线条
同义词：
['recessive line', 'retreating line']
例句：
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1.The sun sets behind the receding line of trees.
太阳在后退的树线后面落下。
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2. The river is receding due to the heavy rain.
由于大雨，河流正在后退。
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3. The car's headlights are receding as it speeds up.
汽车加速时，车头灯正在后退。