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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He continuously hopped up and down as he was running forward, kicking his little legs in the air and across the surface of the water before inevitably falling face-first into the waves.

他不停的跳起跳下，向前奔跑，努力的在头沉下去之前，踢踹、击打水面。

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A surface temperature databank like this, and the infrastructure around it, would be a big step forward.

像这样的地表温度数据库和其配套的基础设施也将是一大进步。

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Panesar claimed 3-10, admittedly against Warwickshire's lower order, but he will make the journey to Cardiff on Monday for the first Test against Australia looking forward to bowling on a surface which is expected to favour spinners.

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Below the surface, the glider converts wave motion into forward thrust to tow the float no fuel, no fuss.

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Secular forces that lurked so long beneath the surface of the economy, like housing and latent capital goods spending, should carry us forward.

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