... 柔性系数 flexibility factor 公用工程管道 utility piping 管道和仪表流程图 piping and instrument diagram ...
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与此同时在美国宾夕法尼亚州，许多承担公用工程设施建设的公司表示他们在跟进新天然气连接管道建设的进度上遇到了麻烦。
Meanwhile, back in Pennsylvania, some utilities say they're having trouble keeping up with demand for new gas hookups.
供应诸如电和水等公用工程的公司，有规定允许竞争对手使用它们的线路或管道。
There are rules for companies that supply utilities like electricity and water to let competitors use their wires or pipes.
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