海狸 - 建筑大师 Beavers - The Master Builders


Sir David Attenborough narrates a documentary on beavers. One of nature's most industrious animals, beavers divert rivers, fell trees and build log cabins. But unlike humans, any one beaver can embody all the skills of a lumberjack, a carpenter, an architect, a surveyor and a hydro-engineer.

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