So, to compare Newtonian and Einsteinian relativity, one has to turn to the cosmos.

因此，要比较牛顿相对论和爱因斯坦相对论，我们必须转向宇宙。

Metaphors can be particularly helpful in explaining unfamiliar concepts: imagining the Einsteinian model of gravity (heavy objects distort space-time) as something like a bowling ball on a trampoline, for example.

在解释不熟悉的概念时，比喻尤其有用：例如，把爱因斯坦的重力模型(重物会扭曲时空)想象成蹦床上的保龄球。