All sailboats need a keel of board for this reason: the narrow, flat surface of the board or keel produces little drag when the boat moves forward but resists motion sideways.

所有的帆船都为了这个理由需要某种龙骨：狭窄平滑的龙骨表面对于帆船的前行几乎没有阻力，但却能很好抗拒侧移力。

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All rudders cause drag, both when steering the boat and in the "neutral" position.

所有舵造成拖累，既当督导船并在“中立”立场。

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Every centimeter of the boat that is in contact with the water induces drag.

每厘米的船，是在与水接触的诱导阻力。

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But this lobster boat captain thinks as long as there are lobsters in the Boston Harbor, there will be lobstermen to drag them up.

VOA: standard.2010.07.20

One method:Drag a shipment underwater behind a fishing boat.

FORBES: Magazine Article