这个问题仍然没有答案;事实上,根据所有证据,我们不能基于恐龙骨骼对恐龙生理学做出一个明确的声明。
This question remains unanswered; indeed, taking all the evidence into account, one cannot make a definitive statement about dinosaur physiology on the basis of dinosaur bone.
应用于某些可用拖车运输的,没有重固定龙骨的帆船上的一个系统。
A system used in some trailerable sailboats without a weighted fixed keel.
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.
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