水银是液态金属，行星水星是肉眼能看到的运动最快的天体。

Mercury is a liquid metal, and Mercury, the planet, is the fastest moving heavenly body that naked eyes can see.

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水银是一种液态金属，而水星这颗行星，是肉眼能看到的运动最快的天体。火星，为什么火星是红色的？

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

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