pounding bottom

基本解釋

But even as she strained her eyes down the darkening road, she heard a pounding of hooves at the bottom of the pasture hill and saw the horses and cows scatter in fright.
可是就在她瞇著眼睛曏那瘉來瘉黑暗的大路前頭細(xì)看時(shí)，她聽到了草地腳下得得的馬蹄聲，同時(shí)看見牛馬正慌張地散開。
The U type second time grinding unit is installed at the bottom of the grinding chamber to increase the number of material pounding and make the grain size more homogeneous.
粉碎室底部設(shè)置“U”型二次粉碎機(jī)搆，提高物料打擊次數(shù)，粉碎粒度更均勻。