名词
中文翻译：Unknown
同义词：
['retrograde', 'backwards', 'inverse']
例句：
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2.
在物理或数学中
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3.
在物理学中
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1. The runner had to reverse his direction and run back the way he had come.
跑步者不得不改变方向，跑回他来时的方向。
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2. In mathematics, a reciprocal is a number that has the opposite sign as its multiplier.
在数学中，一个倒数是具有与乘数相反符号的数字。
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3. The scientist found that the chemical reaction was reversible, meaning it could be made to go backwards.
科学家发现化学反应是可逆的，意味着它可以被倒转回去。