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。

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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。

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Take the initiative to roll from the machine, Cong moving roller, trough, rack, electrical components.

本机由主动辊、丛动辊、料槽、机架、电机组成。

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She sank into a trough but another, taller roller swept in fast.

NPR: Excerpt: 'The Assassins Gallery'

Rates have roller-coastered through two peaks and troughs in the past decade, and when the bottom of the current trough will be reached is anybody's guess.

ECONOMIST: Insurance