They also have 30 percent more feathers in the winter and can fluff them up, trapping a layer of warm air.
它们的羽毛在冬季也要增加30%，它们把羽毛蓬松开，来保留住一层温暖的空气。
This is covered by an upper layer of warm air that ACTS like a lid. It prevents the polluted cooler air from rising.
这层冷空气就阻挡了这些被污染的冷空气，使之不能上升的高空中。
Whereas dolphins and whales rely on thick blubber to help keep warm in cold water, fur seals and sea otters depend on dense fur to trap a layer of air against their bodies.
在寒冷的水域中，海豚和鲸鱼依靠它们厚厚的脂肪进行保暖，而海狗和海獭则依赖于它们那稠密的皮毛来留住空气层。
This is covered by an upper layer of warm air that ACTS like a lid.
上面的暖空气层覆罩着它们，作用就像一个盖子。
This is covered by an upper layer of warm air that ACTS like a lid.
上面的暖空气层覆罩着它们，作用就像一个盖子。
应用推荐