We think the Mars is a lifeless planet.
我们认为火星是一个没有生命的星球。
And today many scientists think that all of the alleged signs of life in the rocks could have just as easily been made on a lifeless planet.
而今，大多数科学家认为，岩石上所有已知的生命迹象都能够轻易地在一个无生命的星球发生。
To begin with, scientists thought the Red Planet was as lifeless as the Moon, with dust storms swirling over vast sandy deserts.
始于尘沙笼罩下的广阔沙漠的图片，科学们认为这个“红色星球”像月球一样没有生命。
That planet is probably lifeless.
那颗行星上可能没有生命。
That planet is probably lifeless.
那颗行星上可能没有生命。
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