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Funnel shall be installed above the engine casing.
烟筒应该安装在机舱顶棚上。
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An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well.
套管柱顶部的一根大口径管，形如漏斗，以引导钻井工具进入到井眼的顶部。
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