凤凰号90天的任务就是分析火星北极冻土的土壤和永久冻土带，看他们在过去和现在是否有生命存在的信号。
The Phoenix's 90-day mission is to analyze the soils and permafrost of Mars' arctic tundra for signs of past or present life.
凤凰号90天的任务就是分析火星北极冻土的土壤和永久冻土带，看他们在过去和现在是否有生命存在的信号。
The Phoenix's 90-day mission is to analyze the soils and permafrost of Mars' arctic tundra for signs of past or present life.
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