We assume that the bodies obey Newton's Third Law. 設物體遵從牛頓第三定律。
Developments in physics since the time of Newton make the law of momentum conservation appear to be more fundamental than Newton's third law. 牛頓時(shí)代以來(lái)物理學(xué)的發(fā)展，使動(dòng)量守恒定律顯得比牛頓第三定律還重要。
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