只有电动机变得先进时，真空吸尘器才会普遍使用。
It was only when electric motors became advanced that vacuum cleaners became common.
波音公司试飞了一架利用燃料电池做动力来驱动电动机的迪莫诺动力滑翔机。
Boeing has flown a Dimona motor glider with an electric motor powered by a fuel cell.
2006年，他转向了动力滑翔机，同时把小型内燃机拆了下来，用电池和电动机来替代。
In 2006 he converted a powered hang-glider, removing its small combustion engine and replacing it with a battery and an electric motor.
单相电动机运转时，产生与运转方向逆方向的转矩，因此不可能在短时间内改变方向。
The single-phase motor has a reverse direction with the totating's when operated.
还介绍了电动机的线性化范围和测试标准。
The range of linearisation and testing standard of the motor is also presented.
作为一个初学者你肯定不会希望你的电动机影响或烧毁你敏感的电路。
As a beginner you do not want your motors interfering with or even melting your sensitive circuitry.
下一次，机器人会选择一种表情，且其选择倾向于使电动机在正确的设置上。
Next time the robot picks an expression, there's a bias towards putting the motors in the right configuration.
而且，如同电动机一样，人造肌肉还能反过来当发电机使用，将运动转化为电力。
And, just like motors, artificial muscles can also be used in reverse as generators, transforming movement into electricity.
采用人造肌肉代替电动机可减小太空探测器和机器人的体积与重量。
Using artificial muscles in place of motors could reduce the size and weight of space probes and robots.
波音公司也试飞了利用燃料电池做动力来驱动电动机的动力滑翔机。
Boeing has also flown a Dimona motor glider with an electric motor powered by a fuel cell.
在许多情况下，在工业设备中使用由电池电力驱动的电动机比使用柴油发动机效率更高。
In many cases, using electric motors powered by batteries will be more efficient than running diesel engines in industrial equipment.
制造颜料，烘干需要的热量，照明，电力，传动带，电动机，一家工厂所需要的一切设备，等等，所有这一切需要多少技能？
How many skills went into the making of the tint and the kilns, into supplying the heat, the light and power, the belts, motors, and all the other things a mill requires?
但是也可以通过在前轮上安装电动机来实现四轮驱动。
But motors could be fitted to the front wheels as well to provide four-wheel drive.
不过，随着一种更轻便灵巧、耗电量更小的替代品开始插足电动机的领地，毫不夸张地说，这种情况即将改变。
But that could be about to change as a lighter, more flexible and less power-hungry alternative starts to muscle in, quite literally, on the motor's patch.
他建议采用电动机或者有形状记忆功能的材料来反复击打软体契形翅膀的末端，让水产生向后的涟漪从而获得向前的推力。
He suggests using electric motors or shape-memory materials to repeatedly flick the end of a flexible, wedge-shaped wing, creating a wave that ripples backwards and generates forward thrust.
飞行器以发泡聚丙烯为主体，在其背部与两个升降舵补助翼（可以操控的界面）上有一个电动机。
The flying robots were built out of expanded polypropylene with a single motor at the rear and two elevons (control surfaces that enable steering).
利用13.8米长的翼展和一个42千瓦的电动机，E430可以在空中持续飞行3个小时之久。
With a 13.8-metre wingspan and a 42kw electric motor, the E430 has a flying time of up to three hours.
所以2006年，他转向了动力滑翔机，同时把小型内燃机拆了下来，用电池和电动机来替代。
So in 2006 he converted a powered hang-glider, removing its small combustion engine and replacing it with a battery and an electric motor.
电动机不需要齿轮变速箱，因此可以减轻重量和机械复杂性。
Electric motors do not need a gearbox, which reduces weight and mechanical complexity.
机身上的圆盘形整流天线能接收地面传输的微波能，将其转化为直流电为飞机推进器上的电动机供能。
A large disc-shaped rectifying antenna attached to the fuselage harvested the microwave energy, turning it into direct current to power an electric motor attached to the plane's propeller.
目前这款车采用了两台电动机，分别用来驱动两个后轮。
At present two electric motors are used, one powering each of the rear wheels.
结果，电动机润滑油中的ZDDP得以逐步减少。
As a result, the ZDDP in motor oils has been steadily reduced.
另外传统的每辆劳斯莱斯都以舒适，敏捷和安静和著称，电动机在这方面更胜一筹。
And as every Roller is famously smooth, swift and silent, electric motors can hardly excel in that department either.
电动机的能量来源于一组506磅的锂电池组，捷豹公司表示，在240伏电压下，一次充满电只需要6小时。
Power for the electric motors comes from a 506-pound lithium-ion battery pack, which Jaguar claims takes a full charge in just 6 hours at 240 volts.
和汽车制造商一样，他们正试图将内燃机引擎和电动机结合起来以便节省燃油。
Like carmakers, they are trying to combine internal-combustion engines and electric motors to save fuel.
但在某些应用方面，它似乎可以与老式的电动机匹敌。
But in some applications, it seems, they could give the venerable electric motor a run for its money.
过去，异步感应电动机的主要缺陷是难于变速。
In the past, the main disadvantage of asynchronous induction motors was the difficulty of varying their speed.
过去，异步感应电动机的主要缺陷是难于变速。
In the past, the main disadvantage of asynchronous induction motors was the difficulty of varying their speed.
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