An element is an object that you can put inside a pipeline, wrapping some operation on the media inside.

元素是可以放入到管道中的对象，其中包装了对媒体进行的某种操作。

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China-Russia oil pipeline has been formally put into operation and the bilateral cooperation in the energy fields of coal, natural gas and electricity moves forward steadily.

中俄原油管道正式投产运营，煤炭、天然气、电力等能源合作进展顺利。

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Listing 1 illustrates an XProc pipeline with a single step that applies an XSLT operation to an XML document.

清单1展示了一个包含单个步骤的Xproc管道，该步骤对XML文档应用XSLT操作。

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The largest issues facing pipeline safety today come from the actions of third parties completely unrelated to the actual operation of the pipeline, such as construction projects, excavation, utility work, planning and zoning decisions near pipelines, and even homeowners.

FORBES: Pipeline Infrastructure: Rhetoric v. Reality

The first part of the operation to stop the Shell pipeline leaking oil into the North Sea has, according to the company, been successful so far.

BBC: Shell claims progress on North Sea oil leak

We also need to build a new water pipeline because the existing operation will need a new water source by mid-2015.

FORBES: Tasiast 'Pre-Feasibility Study Does Not Mean Imminent Construction' -- Kinross CEO