But birds never fly too high, because the air in the high sky is too thin, they can not live in thin air.
但是，鸟们不能飞太高，因为高空的空气稀薄，他们在稀薄的空气里无法生存。
The Mars we see today, doesn't have either of those conditions. It's too cold, and the air is too thin.
我们现在的火星没有这两个方面的结论：他太冷了而且大气层太稀薄了。
The Mars we see today, doesn't have either of those conditions. It's too cold, and the air is too thin.
我们现在的火星没有这两个方面的结论：他太冷了而且大气层太稀薄了。
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