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。
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。
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。
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。
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。
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