A petrel does not dig a burrow where it does because of the average temperature or wind speed on the island but because of how warm or windy it is at that particular spot.

海燕并不会由岛上的平均温度或风速，来决定应该在哪里挖掘洞穴，而是根据特定地点的暖度与风速而定。

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From a research station operated by the National Science Foundation called Summit Camp, a spot where the ice sheet is about 2 miles thick, GROVER will crawl at an average speed of 1.2 mph (2 kilometers per hour).

ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)