As to your request, I do not think the beavers are aware that they must first fill out a dam permit prior to the start of this type of dam activity.

关于你的要求，我并不认为这些海狸知道在开始这种建坝活动之前，他们必须填表来获得允许。

youdao

Cement sand and gravel (CSG) dam is a new type of dam between concrete-faced rock-fill dam (CFRD) and roller compacted concrete dam (RCC).

胶凝砂砾石坝(CSG)是介于混凝土面板堆石坝(CFRD)和碾压混凝土重力坝(RCC)之间的一种新坝型。

youdao