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例句：

1. 1. The beavers are busy buildingtheir dams in the river.
   河狸们忙着在河里筑坝。
2. 2. Otters are known for their playfuland curious nature.
   海獭以其活泼好奇的天性而闻名。
3. 3. The beavers have been asymbol of conservation efforts in manyregions.
   河狸一直是许多地区保护工作的象征。