The planet Mars is the closest and most similar planet to Earth.

火星是离地球最近、和地球最相似的行星。

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Mars is too faint and too low in the sky to be observable.

火星太暗，在空中位置太低，所以观测不到。

《柯林斯英汉双解大词典》

Mars is red in colour and is very cold.

火星是红色的，非常冷。

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The orbiter could finally provide evidence about how methane on Mars is created and destroyed.

VOA: special.2009.12.30

This is his portrait of Mars. Mars is the god of war.

这是他的《战神马尔斯》

耶鲁公开课 - 欧洲文明课程节选

Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?

水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体,火星，铁，为什么火星是红色的？

麻省理工公开课 - 固态化学导论课程节选

And the rocket that would go to Mars is still at least a technological generation away.

FORBES: SpaceX Billionaire Elon Musk Wants A Martian Colony Of 80,000 People

Mars is investing tens of millions to advance sustainable cocoa farming practices to head off supply chain disruptions.

FORBES: The Next Global Debt Crisis

What Viking did discover, a very important discovery, is that the surface of Mars is very highly reactive chemically.

NPR: Revisiting the Viking Missions to Mars