名词
中文翻译：规则
同义词：
['law', 'principle', 'rule']
例句：
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1. The law of gravity states that objectsfall towards the center of the Earth.
万有引力定律表明物体会向地球的中心下落。
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2. The principle of conservation of energystates that energy cannot be created or destroyed.
能量守恒原理表明能量不能被创造或销毁。
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3. The rule of three statesthat in any group of three people,there must be at least one man,one woman, and one child.
三原则规定在任何三人组中，至少有一个男人、一个女人和孩子。