成国栋解释说，建设过程中对青藏高原永冻层所造成的威胁比全球气候暖化大。
Guodong explains that the construction impact posed a greater threat to the plateau permafrost than global warming.
这是北极永冻地区的植物气候。
This is the vegetational climate of arctic permafrost regions.
这是北极永冻地区的植物气候。
This is the vegetational climate of arctic permafrost regions.
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