The nineteenth century witnessed a revolution in ship design and propulsion.
19世纪经历了船舶设计和推进上的一次重大变革。
Scientists and engineers are beginning to study this ability of fishes in the hope of designing more efficient propulsion systems for ships.
科学家和工程师们开始研究鱼类的这种能力，希望能设计出更有效的船舶推进系统。
The large hind legs were used for propulsion in water.
巨大的后肢用于在水中驱动。
But magnetic propulsion has some drawbacks.
但是磁力推进有一些缺陷。
Beamed propulsion is yet another interesting concept.
光束推进器则是另一个有趣的概念。
Innovations and the Future of Interstellar propulsion.
星际推进器的革新和展望。
The hydrogen propulsion system will be the key to Phantom Eye's success.
氢推进系统将是幻影眼成功的关键。
The work at Cornell is testing hypotheses of insect propulsion and control.
在康奈尔大学的工作是测试昆虫的推进力和可控性。
He is not aware of another electric propulsion system designed for CubeSats.
他并不熟悉另一项为立方体卫星设计的电力推进系统。
Its nuclear propulsion units drive the British Royal Navy's submarine fleet.
它的原子能推进组件驱动了英国皇家海军的潜艇舰队。
What You'll Learn: What will make up the future of rocket-propulsion systems!
你将学习：火箭推进系统的未来走向。
The drive wheels then rotate as necessary, to achieve both balance and propulsion.
然后驱动轮按需转动，同时实现平衡和推进。
It's like a slingshot — the harder you pull, the more propulsion you generate.
如同一把弹弓，拉的越紧，射的越远。
"Electric propulsion has a lot of benefits over internal combustion engines," he said.
他说：“电力推进相对内燃发动机来说有很多好处。”
'a bird's wing, comrades,' he said, 'is an organ of propulsion and not of manipulation.
“同志们，鸟类的翅膀，”他说，“是一个推进前行的器官，而不是用来操纵的器官。”
This time around, the propulsion system relies on tried-and-true bicycle-style pedals.
而这次，推动系统依靠久经考验的自行车式的踏板。
The researchers acknowledge that some propulsion system technology still needs to be explored.
研究人员承认，还有一些推进系统技术问题需要作进一步的探讨。
NASA plans to test a full-size solar sail for chemical-free propulsion and a deep space atomic clock.
此外，美国国家航空航天局（下文简称NASA）还计划测试一个完整尺寸的太阳帆，为航天器提供绿色推进能源，以及测试一个深空原子钟。
So far NASA is exploring two options for propulsion there? A nuclear thermal rocket and a chemical engine.
迄今为止NASA研究了两种前往那里的备选推进器：核热火箭和化学发动机。
Although other electric propulsion systems exist, they require a pressurized container to store the propellant.
尽管其他电力推进系统存在，他们需要一个高压的容器来贮存推进剂。
Into the 20th century, steam propulsion became so advanced that you could ride a giant steamer across the ocean.
到了20世纪时，蒸汽推进的技术越来越进步，你甚至可以搭着大型蒸汽船横渡海洋了。
The thruster design requires that the total volume of the propulsion system be less than 10 percent of the CubeSat.
这个推进器设计规定了推进器系统的总体积不超过立方体卫星的10%。
There is still a significant gap in current propulsion technology and what may be needed for an interstellar mission.
我们现有的推进技术和我们需要的应用于星际飞行的推进技术仍然有很大的差距。
And you could still count yourself as an early adopter of this historic development in automotive propulsion systems.
此外，驾驶者还借此成了历史上第一批采用新型汽车动力系统的人之一。
In that short time, all of the mechanical forces that produce forward propulsion must be transferred through the leg.
在如此短暂的时间内，所有产生向前推力的机械力必须通过腿来传递。
Even with electric propulsion systems, certainly one of the most promising technologies, a distinction needs to be made.
即便有了最理想的技术之一——电力推动系统，我们仍需加以区别。
But the 80-member team has increasingly focused on battery propulsion, Kranz says, as regulators around the world tighten emissions standards.
但Kranz说随着世界各地的监管机构提高汽车尾气排放标准，这个拥有80个成员的研发团队正将精力日益集中于电池推进型汽车上面。
But the 80-member team has increasingly focused on battery propulsion, Kranz says, as regulators around the world tighten emissions standards.
但Kranz说随着世界各地的监管机构提高汽车尾气排放标准，这个拥有80个成员的研发团队正将精力日益集中于电池推进型汽车上面。
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