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。
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.
你可以不喜欢他们，但是表面上对婚姻沾沾自喜的人，有很好的理由感到满意。
You may not like them, but it appears' smug marrieds' have a good reason to feel pleased with themselves.
表面的理由是树立一个好榜样，但我知道怀特其实希望我不敢接受测试。
The ostensible reason was to set a good example, but I knew White was hoping I wouldn't do it.
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