Definition: a statement or relationship that is always true in science, mathematics, etc. Level: C2
牛顿的万有引力定律是物理学中的一个基本概念。
Newton's ___law of gravity is a fundamental concept in physics.
在统计学中，平均律确保了结果会随着时间推移而趋于平衡。
In statistics, the ___law of averages ensures that outcomes will even out over time.
科学定律描述的是在自然界中观察到的恒定现象。
A scientific ___law describes a consistent phenomenon observed in nature.
