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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TV has owned brand awareness, imaging, and intent—the so-called top of the funnel metrics—for decades.

电视广告的品牌意识、广告形象和受众倾向（即所谓的漏斗原理），使其占据广告龙头地位达数十年之久。

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TV has owned brand awareness, imaging, and intent—the so-called top of the funnel metrics—for decades.

电视广告的品牌意识、广告形象和受众倾向（即所谓的漏斗原理），使其占据广告龙头地位达数十年之久。

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