But without a thick atmosphere to trap heat, it is possible that permanently Shadowed regions could stay cold enough to preserve ices for millions, if not billions, of years.

但是如果不是水星上厚厚的大气层留住了热量，那些永久背光的地区很可能有积存了几百万或是几十亿年的冰存在的。

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But without a thick atmosphere to trap heat, it is possible that permanently Shadowed regions could stay cold enough to preserve ices for millions, if not billions, of years.

但是如果不是水星上厚厚的大气层留住了热量，那些永久背光的地区很可能有积存了几百万或是几十亿年的冰存在的。

youdao