Propulsion is provided by a rocket engine, rather than a propeller and rudder, which makes steering difficult.
推进器是由火箭发动机提供的，而不是螺旋桨和方向舵，这使得转向变得困难。
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。
Cerf has been working with NASA's Pasadena Jet Propulsion Laboratory—the people behind the recent Mars expedition—to design what he calls an "interplanetary Internet protocol."
瑟夫一直在与美国宇航局的帕萨迪纳喷气推进实验室（最近火星探测的幕后人员）合作，设计他所说的“星际互联网协议”。
The large hind legs were used for propulsion in water.
巨大的后肢用于在水中驱动。
Their high, narrow tails with swept-back tips are almost perfectly adapted to provide propulsion with the least possible effort.
它们又长又细的尾巴配合后掠式的襟翼，完美地适用于最省力的方式提供推动力。
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 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。
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。
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。
Each SPHERE satellite comprises functionality for power, propulsion, computing, and navigation.
每个SPERES卫星可提供能源、推进、计算和导航功能。
The result had neutral buoyancy, allowing the animal to move (like squid) by jet propulsion.
这样的结构具有中性浮力，使得鹦鹉螺能够靠后推力移动（像枪乌贼一样）。
A novel part of the design is a second propulsion system that simulates low-gravity environments.
这件设计很新奇的部分在于模仿低重力环境第二推进系统。
Projected advances in battery technology enable a unique, hybrid turbo-electric propulsion system.
设想中先进的电瓶技术有助实现一种独特的氢动力涡轮-电力推进系统。
Subsequent activity presumably has involved installing the missing electronics and propulsion systems.
接下来的事大概就可以推测出来了：安装丢失的电子设备和推进系统。
That's the idea behind solar sails, which harness radiation for propulsion in space, for instance.
太空旅行计划促成这一想法的实现，比如利用太阳辐射产生推动力。
The Spitzer mission, launched in 2003, is managed by the jet propulsion laboratory in Pasadena, California.
2003年，在加利福尼亚州帕萨迪纳市，美国喷气推进实验室发射了“斯皮策”太空望远镜。
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%。
Puma's standard propulsion system comes equipped with rechargeable batteries with a listed flight time of 2.5 hours.
“美洲豹”标准推进系统是可提供2.5小时飞行时间的充电电池。
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。
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