So whenever humans want to keep an object in one place for a long time without using tons of fuel, it needs to be orbiting a Lagrange point.

因此，当人类希望不消耗大量燃料将物体长时间保留在一个地方时，它得绕着拉格朗日点运行。

Its largest and closest moon, Charon, is so large compared to Pluto that they actually orbit a point between each other, causing some astronomers to call Pluto and Charon binary, or double, dwarf planets.

卡戎是最大也是距冥王星最近的卫星，它甚至有些太大了，它们公转轨道的中心是两者之间的一个点，一些天文学家把它们称作双星，或者双矮行星。