大卫星

Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.

地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。

What does the largest moon in the Solar System look like?

太阳系最大卫星的长像如何？

Our Milky Way galaxy has two large satellite galaxies orbiting it.

有两大卫星星系环绕着我们的银河系转动。

A halo surrounds Titan, Saturn´s largest moon.

有一个光环包围着土卫六，土卫六是土星的最大卫星。

But Saturn´s fellow gas giant planet Jupiter has four big moons.

而和土星同样是巨大气质行星的木星却有4颗大卫星。