An electric motor powers the boat up to five miles per hour.

电动机为船提供动力， 速度可达每小时 5 英里。

Even the motor powering the gentle flapping is a soft disc which contracts in response to electrical impulses, sort of like an artificial muscle.

甚至为轻柔拍打提供动力的电机也是一个软盘，它会响应电脉冲而收缩，有点像人造肌肉。

Two hydraulic motors power the crawlers via closed planetary gear units that run in oil baths and have spring-loaded, hydraulically released holding brakes.

两台液压马达通过封闭式行星齿轮装置为履带提供动力，行星齿轮装置在油浴中运行，并具有弹簧加载、液压释放的保持制动器。

He had, he says, always been interested in flight, and some back-of-the-envelope calculations he made suggested that electric lift-off of a human-carrying craft, using motors powered by the lithium-ion batteries that were then becoming fashionable, ought to work.

他说，他一直对飞行感兴趣，他所做的一些粗略计算表明，使用由锂离子电池供电的电机电动升空载人飞行器，当时锂离子电池已成为时尚，应该有用。