要小心谨慎，避免管道内密封剂。

Care should be taken to avoid getting jointing compound inside pipes.

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tee pc2mf 则将内容放到第三行命令要检索的管道内。

tee pc2mf, which will put it in the pipe where it will be retrieved by the third line.

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类似地，屋顶的吸热板可以加热管道内的液体，为住宅提供热水。

Similarly, absorbent plates on a roof can heat liquid in tubes that supply a house with hot water.

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