It consisted of a granite trough, with a roller, normally constructed of the same material, which pushed the warm liquid chocolate backwards and forwards for several days.
它由一个花岗岩槽和一个通常是相同材料的滚筒组成，后者将暖乎乎的巧克力流体来回辗压数天时间。
2
Depressed trough, manhole edges and other places where the roller can not reach shall be compacted with frog rammer.
在压路机不能达到的路槽和检查井边缘，采用蛙式打夯机夯实。
3
Take the initiative to roll from the machine, Cong moving roller, trough, rack, electrical components.