1. 彗星和其他的行星同樣是太陽家族的成員。
   Comets are just as much members of the sun's family as (are) the other planets.
2. 火星是太陽系的第四顆行星。
   Mars is the fourth planet in order from the sun.
3. 彗星象行星一樣繞太陽運(yùn)轉(zhuǎn)，然而其軌道呈狹長(zhǎng)的橢圓形。
   Comets move around the sun like planets, but in long oval course.
4. 土星是依次離太陽的第六顆行星。
   Saturn is the planet sixth in order from the sun.
5. 我們太陽系的行星有水星、金星、地球、火星、木星、土星、天王星和海王星。
   The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
6. 地球是一顆行星。
   The Earth is a planet.

行的英語翻譯：

星的英語翻譯：