名词
中文翻译：等式
同义词：
['equation', 'balance condition']
例句：
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1. The equation of motion is the law of conservation of momentum.
动量守恒定律是运动方程。
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2. The teacher explained the equation of force to us in detail.
老师详细地解释了力方程。
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3. The scientist used the equation of pi to calculate the area of a circle.
科学家使用π的方程来计算圆的面积。