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。
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。
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。
Call it the Jet Propulsion Laboratory's version of the Final Four.
这四个登陆点的选择被称为喷气推进实验室版的终极四强赛。
New propulsion plants providing a 25% increase in available energy.
新的推进工厂为可用能源提供25%的增长。
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。”
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。
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