但是在将近1亿年前，现代蛇类的近亲们靠着它们船桨似的尾巴在白垩纪的水流里随波起伏，拖曳着它们短小而笨拙的后腿。
But nearly 100 million years ago relatives of modern snakes undulated through Cretaceous period waters aided by a paddlelike tail and dragging a pair of short, footless hind legs.
理论预报采用STF法，在水动力计算中加入粘性与航态修正；在船模拖曳水池进行耐波性试验。
STF method with modification of viscous and bow up state was used for theory prediction, and model test for sea-keeping performance was done in towing tank.
一艘汽艇以每小时20英里的速度，拖曳着尾波滑水玩家在水上滑行。
A motorboat pulls the wakeboard rider through the water, traveling at around 20 miles an hour.
拖曳水池中非规则长峰波的试验模拟质量将直接影响到船舶和海洋结构物耐波性试验研究的准确性。
The accuracy of the ship model seakeeping tests is greatly dependent on the quality of the long-crested irregular waves generated in the test lab.
介绍一个建于船模试验拖曳水池中的直推式16摇板电液伺服控制造波机和波浪模拟方法及其计算机控制。
An introduction of a 16 channels electro-hydraulic servo control wave maker constructed in a ship model testing towing tunk. the sea wave simulation method and it's computer control.
介绍一个建于船模试验拖曳水池中的直推式16摇板电液伺服控制造波机和波浪模拟方法及其计算机控制。
An introduction of a 16 channels electro-hydraulic servo control wave maker constructed in a ship model testing towing tunk.
介绍一个建于船模试验拖曳水池中的直推式16摇板电液伺服控制造波机和波浪模拟方法及其计算机控制。
An introduction of a 16 channels electro-hydraulic servo control wave maker constructed in a ship model testing towing tunk.
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