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1·These rocky planets are called Terrestrial Planets.

这些岩态行星被称为“类地行星”。

2·By comparison, the terrestrial planets have meager atmospheres at best.

相比之下，类地行星最多只有稀薄的大气层。

3·However, unlike Jupiter, the terrestrial planets today are nearly void of light gases and ices.

然而，如今的类地行星与木星不同，几乎没有轻气体和冰。

4·The terrestrial planets are mostly rocks: dense rocky and metallic material, with minor amounts of gases.

类地行星主要是岩石：密度大的石块和金属物质，同时会有少量的气体。

5·These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals.

这些小行星像类地行星一样，主要由岩石物质和金属构成。

6·The terrestrial planets—like Mars and Earth—composed largely of rocks and metals, and the large gas giants, like Jupiter.

诸如火星和地球这样的类地行星主要由岩石和金属构成，而木星则是大型气态行星。

7·Also, because of their relative locations, the four Jovian planets are known as the outer planets, while the terrestrial planets are known as the inner planets.

同样，由于它们的相对位置，四颗类木行星被称为外行星，而类地行星被称为内行星。

8·The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water.

类地行星的密度的平均值大约是水的密度的五倍，而类木行星的密度平均值只有水的密度的1.5倍。

9·In this, mercury differs from the other terrestrial planets.

在这方面，汞不同于其他类地行星。

10·Mercury, Venus, Earth, and Mars are sometimes called the terrestrial planets.

水星、金星、地球和火星通常被称为陆地行星。