The article describes structure, working principle, design method and characteristics of general pneumatic dust collecting device with equal section main pipe for largescale wood processing mills.

本文阐述了通直等断面主管道式通用型气力吸集装置的结构、工作原理、设计计算方法及使用特点。该系统适用于大型木材加工车间。

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The main pipe, the branch pipe, and the breathing pipe all are hoses.

主管、支管和通气管均为软管。

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The main pipe burst in the severe cold, and the gas has been getting out.

主管道在严寒中冻裂了，煤气泄漏了出来。

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Thad Allen, the government's point man in the region, said BP has determined there are three sections of drill pipe that need to be removed -- a main pipe and two shorter ones.

CNN: STORY HIGHLIGHTS

The external hull will be blasted and painted, hatch covers will be renewed as well as work on the main engine and pipe work.

BBC: Coal ship repairs return to Tyneside yard

Part of a main road has collapsed in Surrey leaving a car submerged in water after a mains pipe burst.

BBC: Woking A320 collapses after Veolia water mains burst