| 单词 | Castor canadensis |
| 例句 | Castor canadensis even paved the way for agriculture: By trapping sediment in their ponds, beavers "produced the rich farm land … of the northern half of North America," paleontologist Rudolf Ruedemann wrote in Science in 1938. Beaver dams without beavers? Artificial logjams are a popular but controversial restoration tool 2018-06-07T04:00:00Z |
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