森林守护人员拆除了坝堤，而海狸们又把坝堤恢复起来。

Forest rangers take down the DAMS, and the beavers rebuild them.

youdao

森林守护人员拆除了坝堤，而海狸们又把坝堤恢复起来。

Forest rangers take down the DAMS, and the beavers rebuild them.

youdao