A lower drag board connector is used for the cleaner of the roving frame, which is used for cleaning yarn.

用于粗纱机上清洁纱线的清洁器的下涨力板结合件。

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Drag the "Note - Sketch" item (marked with an arrow) onto the art board. You'll get an area you can type in.

拖动“note—sketch”项目(箭头所指)到美术板上。

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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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