martian rock/amn

21.   Water is considered essential for the evolution of life and some scientists believe they have evidence, from a Martian rock, that the planet once had life.

a. + rock >>共 1111 个
alternative 2.86%
volcanic 2.47%
large 2.42%
solid 1.72%
classic 1.69%
big 1.55%
british 1.42%
red 1.30%
falling 1.22%
molten 1.17%
martian 0.58%
martian + n. >>共 110 个
surface 14.77%
atmosphere 13.80%
life 8.47%
meteorite 5.81%
rock 5.08%
soil 4.36%
landscape 2.66%
microbe 2.42%
climate 2.42%
terrain 1.94%
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