In some regions, due to such factors as terrain, traffic, etc. it is unavoidable that two or more oil or gas pipelines are laid in parallel.

在部分地区，由于受管道沿地形、交通等条件的制约，两条及以上的管道进行伴行敷设的情况将不可避免。

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For such a long natural gas transport pipeline, gas leakage is unavoidable because of pipeline aging, lithosphere shift and geographic disaster.

如此绵长的输气管道，随着管道设施的老化、地质结构的变化、地质灾害的发生，天然气的泄漏在所难免。

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Chevron's bid to increase enormously the Soviet Union's marketable energy output (in terms of oil and, as an unavoidable part of the recovery process, of gas) clearly is at cross-purposes with this alliance policy.

CENTERFORSECURITYPOLICY: US-Soviet Joint Ventures: The Camel's Nose Under The Tent