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【ASTRONOMY天文學】：Jovian planets類木行星
　
Jovian [ˋdʒovɪən] n. 類木行星
Jovian planets are named after Jupiter, the largest planet in the Solar System. They are also called the gas planets because they consist mainly of hydrogen, or the giant planets because of their size. These planets usually have a complicated system of many moons and often even rings of ice and/or dust. There are four Jovian planets in the Solar System: Jupiter, Saturn, Uranus, and Neptune.
　
Jupiter [ˋdʒupətɚ] n. 木星
Jupiter is the planet that is fifth in order from the sun and is the largest in the solar system.
　
Saturn [ˋsætɚn] n. 土星
Saturn is the planet that is sixth in order from the sun and is surrounded by large rings.
　
Uranus [ˋjʊrənəs] n. 天王星
Uranus is the seventh planet in order of distance from the Sun, after Saturn and before Neptune.
　
Neptune [ˋnɛptjun] n. 海王星
Neptune is the eighth planet in order of distance from the Sun, the fourth largest planet in the solar system.

【ASTRONOMY天文學】：terrestrial planets類地行星
　
1. terrestrial planets [təˋrɛstrɪəlˋplænɪt] n. 類地行星
Terrestrial planets are the planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy metal core, few moons, and topological features such as valleys, volcanoes, and craters. In our solar system, there are four terrestrial planets, which also happen to be the four closest to the sun: Mercury, Venus, Earth and Mars.
　
2. Mercury [ˋmɝkjərɪ] n. 水星
Mercury is the smallest planets in solar system and the one nearest the Sun. 　
　
3. Venus [ˋvinəs] n. 金星
Venus is the second planet in order of distance from the Sun, after Mercury and before the Earth. It is the nearest planet to the Earth.
　
4. Earth [ɝθ] n. 地球
The earth is the third planet in distance from the sun and it is the world on which we live.
　
5. Mars [mɑrz] n. 火星
Mars is the fourth planet in order of distance from the Sun, after the Earth and before Jupiter.

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