动词 roll in:

1. pour or flow in a steady stream

Rollea罗莱亚rolln.卷；滚动；名单；压路机；颤音；圆形物，面包卷v.摇摆；滚；绕；转动；展开roll rate indicator滚速指示器rolling force model轧制力模型rolling of sections型钢轧制roll-back routine重算例行程序, 重新运行程序, 重新运行例行程序, 重新执行程序roll up a poster.把海报卷起来roll-on container滚涂容器rolled flour gluten面肠roll attitude angle滚转姿态角roll seed separator辊式种子清选机roll-over scraper翻转斗式铲运机

1. The little pieces of which are broken off from hills and mountains roll down into the valleys,and we sometimes find great heaps of rough,sharp stones near the bottom of a mountain.
   从岩石上剥落下来的小石头片滚入山谷，我们有时在山脚的附近发现大量粗糙尖锐的石头。