Beavers are mammals native to North America and Europe. 河狸是原产于北美和欧洲的哺乳动物。
They have short legs and a small head. 他们有短短的腿和小小的脑袋。
The beaver is the national animal of Canada. 河狸是加拿大的国家动物。
Beavers are amphibious. Some of the time they live in water, some of the time they live on land. 河狸是水陆两栖的。有时候他们生活在水里，有时候他们生活在陆地上。
Beavers are excellent swimmers. They can stay underwater for up to 15 minutes. 河狸是优秀的游泳运动员。它们可以在水下停留长达15分钟。
Beavers are known for building dams in rivers. 河狸以在河流中筑坝而闻名。
They build the dams as a protection against predators, such as wolves and bears. 他们修建大坝是为了保护自己免受狼和熊等掠食者的侵害。
Beavers always work at night. They carry mud and stones with their fore-paws and carry wood between their teeth. 河狸总是在晚上工作。他们用前爪搬运泥土和石头，用牙齿搬运木头。
Beavers may create a series of dams along a river. 河狸可以顺着河流筑起一系列的水坝。
People often hunt beavers for their furs. Their furs were used to make clothing and hats. 人们经常为了河狸的毛皮而猎捕它们。它们的皮毛被用来做衣服和帽子。
