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。
Both the father bird and mother bird sit on the eggs to keep them warm.
鸟爸爸和鸟妈妈伏在蛋上为它们取暖。
In spring, people put covers over plants to keep them warm at night.
春天，人们晚上在植物上放置一些覆盖物来保持它们的温度。
Because she had to sit on eggs to keep them warm.
因为她必须坐在窝上孵蛋。
Their thick coat and fat keep them warm in winter.
它们的厚厚的皮毛和脂肪在冬天里可以保暖。
They also used fire to give them light and keep them warm in winter.
他们也用火照明，在冬季用火取暖。
You have the responsibility to watch over others and to help keep them warm and safe.
你有责任关注他人，让他人感受到温暖和安全。
Snow monkeys live farther north than any other monkey. Their long coats keep them warm.
雪猴通常比其它猴子生活的更往北一些的寒冷地区，为了保暖，他们的毛都比较长。
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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