牛顿证实了重力定律。
牛顿力学：牛顿第一、二、三定律，惯性和非惯性参考系，牛顿守恒定律，力和潜能，重力场，向心力，低频振荡。
Newtonian dynamics: first, second and third laws, inertial and non-inertial reference frames, conservation laws, forces and potentials, gravitational field, central forces, small oscillations.
换句话说，她们在寻找当外表的光华退去，当年牛顿在苹果树下想出来的重力学定律在我们身上产生实际效果以后，那些依然存在的品质。
In other words, they are seeking character traits that will be around when the looks fade, and gravity starts to become more than a word we associated with an apple tree, and a guy named Newton.
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