... operation phase 运行阶段 operation pipe 操作管 operation platform 操作平台 ...
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operation pipe string 作业管柱
advanced pipe operation 高级管道操作
At Elias, a completed Chevron operation, the only sound to disturb the replanted clover meadow is a faint whooshing as gas passes to an underground pipe network.
ECONOMIST: Fracking
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