In addition, they have the knowledge on how to make a fire to keep them warm and heat their foods.
另外，他们懂得用火保暖，加热食物。
Today, commercial aircraft remove ice that accumulates on wings in-flight by redirecting hot air from the jet engines to the leading edge of the wings to keep them warm.
今天，商用飞机主要靠把从喷气式引擎排出的热空气引导到机翼的边缘，使它们变暖，以此来达到除冰的目的。
It began with the approach of two or three, who hung about the closed wooden doors and beat their feet to keep them warm.
开始只来了两三个人，他们在关着的木门附近溜达，一边跺着脚取暖。
'I haven't got a shepherd's hut here, as I used to have at Norcombe,' he explained. 'These new lambs would die if I couldn't keep them warm for a while.
“我在这儿没有牧羊人小屋，过去在诺科姆我有一个，”他解释说。“如果不让这几只新生的羊羔暖和一会儿，他们会死的。”
These giants can stand three meters tall and weigh over 500 kg, and they spend their lives traveling throughout the Arctic. Two layers of fur keep them warm.
这些庞然大物高达三米，体重超过五百公斤，他们一生都在北极到处活动。
These giants can stand three meters tall and weigh over 500 kg, and they spend their lives traveling throughout the Arctic. Two layers of fur keep them warm.
这些庞然大物高达三米，体重超过五百公斤，他们一生都在北极到处活动。
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