Thick wall pipes are the core component of so called "four pipe" system for thermal power. It is important to apply circumferential guided wave technique to nondestructive testing of thick wall pipes.

厚壁管道是火电机组四大管道系统的核心部件，将超声导波技术应用于厚壁管道的无损检测显得十分重要。

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Riser pipe: a four-foot-diameter steel pipe called a riser connects the ship to the borehole.

立管：直径四英尺的钢管(称为“立管”)将船和钻孔连接起来。

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These valves have four or five pipe connections, commonly called ports.

这些阀门有四个或五个管道连接，通常称为端口。

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The large hole is believed to have been caused by three small leaks on a four-inch water pipe.

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The leaks - about 5, 000ft (1, 525m) under the surface - were found on Saturday, four days after the Deepwater Horizon platform, to which the pipe was attached, exploded and sank.

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Around midnight, four young men sit near the exit, sharing a fragrant water pipe.

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