天然卫星是指在围绕行星轨道上运行的天然天体。
奶牛跳过地球的天然卫星是个“好主意”，但可能性非常小。
Milk cows jumping over Earth's natural satellite was a neat idea but highly improbable.
这意味着月球这颗地球的的天然卫星可能由于过于干燥而无法存在生命。
And that would mean the Earth's natural satellite may have always been too dry to host life.
地球有一个天然卫星，月球的轨道上三八四〇〇〇公里，是对潮汐负责。
Earth has one natural satellite, the Moon, which orbits at 384,000km and is responsible for the tides.
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