You will hear a recording. Type the missing words in each blank.
你将听到一段录音。请在每个空格里打出缺失的单词。
0:07
The thing that makes it difficult is because even if life had evolved on Mars, the chances of being preserved are very small. If we use Earth as a and our planet is teeming with life, yet it rarely preserves evidence of life of the fossil record. And the focus now is on exploring for environments. If you're looking for water, a of energy, either solar energy or thermal energy or chemical energy, and then carbon, assuming life as we know it on Earth based on carbon. So those are sort of the three things that we're looking for in the course of our mission.
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