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1·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。《柯林斯英汉双解大词典》

2·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。

3·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。

4·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”。

5·The large hind legs were used for propulsion in water.

巨大的后肢用于在水中驱动。

6·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。

7·High-tech industries such as NASA's Jet Propulsion Laboratory have found that their best overall problem-solvers were master tinkerers in their youth.

美国宇航局喷气动力实验室等高科技行业发现，他们最好的全能问题解决者是正值壮年的修理大师。

8·But magnetic propulsion has some drawbacks.

但是磁力推进有一些缺陷。

9·Beamed propulsion is yet another interesting concept.

光束推进器则是另一个有趣的概念。

10·Innovations and the Future of Interstellar propulsion.

星际推进器的革新和展望。

(1)propulsion system推进系统，推进装置

(1)electric propulsion电力推进

(1)jet propulsion喷射推进

(1)jet propulsion laboratory喷气推进实验室

(1)propulsion drive行走部分传动装置；推进传动

(1)rocket propulsion火箭推进；[计]喷射推进