有时当两个特定的行星，例如金星和火星，行进至同处，他们之间产生的化学反应将强于单个行星所能产生的能量。

Sometimes when two certain planets travel together, like Venus and Mars, they create a chemical bond that is stronger than each planet could ever be separately.

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1976人们对于异星生命的存在感到很悲观。 当年海盗一号飞行器登录火星，用它伸出的机械臂抓起了一掊红色的火星尘土并进行了化学测试。

Things were not looking so good for alien life in 1976, after the Viking I spacecraft landed on Mars, stretched out its robotic arm, and gathered up a fist-size pile of red dirt for chemical testing.

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相似的土壤分布得如此广泛，表明一个酸性海洋曾覆盖了大范围的火星表面，或许曾存在具有同样化学特性的众多湖泊。

Such a broad dispersal of similar soils argues for an acidic sea stretching across large swaths of Mars, or perhaps lakes with the same inherent chemistry.

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