It was only when electric motors became advanced that vacuum cleaners became common.

只有电动机变得先进时，真空吸尘器才会普遍使用。

The current flows into electric motors that drive the wheels.

电流流进电机，驱动轮子。

The electric motors of the turret hummed.

炮塔的电动机嗡嗡叫。

This heavy freighter is driven by two electric motors.

这辆重型运输汽车是由两台电动机驱动的。

He envisions it as a sleek, red plane with eight electric motors.

在他的设想中，飞行车就像是一台豪华的飞机，遍体通红，配备八台电动马达。

At present two electric motors are used, one powering each of the rear wheels.

目前这款车采用了两台电动机，分别用来驱动两个后轮。

The plane's wings are covered by solar cells which power four electric motors.

这架飞机的机翼上覆盖了太阳能电池板，为四个发动机提供动力。

A mushroom glade - electric motors for the automatic activation of various valves.

一个类似蘑菇房空地——进行自动化控制各种阀门的电动装置。

The car moves through the electric motors receiving power from onboard batteries.

这车通过板载电池给电动马达驱动。

Electric motors do not need a gearbox, which reduces weight and mechanical complexity.

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。

Lotus, Porsche and Ferrari each unveiled vehicles driven partly by electric motors.

莲花、保时捷、法拉利都发布了部分由电能驱动的车型。

But by 2020, he predicted, most new cars will have their wheels turned by electric motors.

但他预言到2020年，绝大部分新车将会使用电动发电机。

The young Einstein was fascinated by the electric motors and dynamos in his father's factory.

年轻的爱因斯坦迷恋父亲工厂里的电动马达和发电机。

The computer translates them into signals that control small electric motors in her new arm and hand.

计算机把他们转化成控制仿生手臂的电动马达的信号。

The British company’s experimental Evora 414E uses two electric motors, each providing 400Nm of torque.

这家英国公司的实验性产品Evora 414E有两台电动马达，每一台提供400牛-米的扭矩。

Like carmakers, they are trying to combine internal-combustion engines and electric motors to save fuel.

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。

In some gliders small electric motors also slide the batteries backwards and forwards to adjust the pitch.

在一些滑翔器里小型电力发动机也可以前后推动电池来调整倾斜角度。

He has already commissioned a submarine made from high-tech composite materials and powered by electric motors.

他已经雇佣了一艘有高科技合金材料做成的电动潜水艇。

And as every Roller is famously smooth, swift and silent, electric motors can hardly excel in that department either.

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。

The engines used by Ark Angel are electric motors driving counter-rotating propellers, mounted in pods below the hull.

方舟天使使用的引擎是反向旋转的螺旋桨驱动的电动马达，安装在船体下的分离舱中。

The four 10-horsepower electric motors are expected to deliver enough power for a cruise speed of around 40 to 45 mph.

10马力的电动马达预期可以提供40到45英里每小时的巡航速度。

Instead, it is perpetually connected to a generator which powers the car's two electric motors in the rear wheels.

而是与驱动两台后轮马达的发电机全时连接。

The secret (whisper it, lest puritanical greens find out) is that electric motors are better than combustion engines.

秘密在于(小声点，以免极端环保主义者发现这一点)电动引擎比燃动引擎优越。

Traditionally these are large pieces of polished metal, steered by electric motors to keep the sun's rays focused on the cell.

按照传统作法，这些镜板都是大型抛光的金属板块，由电动马达操纵，以保持阳光能集中反射到太阳能电池上。

Materials science: Electroactive polymers, also known as artificial muscles, could replace electric motors in some applications.

材料科学：电活性聚合物，又称人造肌肉，可在某些应用环境下替代电动机。

When wheels are being driven directly by electric motors, different levels of torque can be applied to improve stability on corners.

当电动马达直接驱动车轮的时候，驾车人可以通过运用不同级别的扭矩来增加车辆转弯时的稳定性。

In many cases, using electric motors powered by batteries will be more efficient than running diesel engines in industrial equipment.

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。

I've seen a handful of hubless concept bikes but the Synapse bike goes one further with integrated electric motors to assist the rider.

我以前见过一些无轮毂概念自行车，但是这款突触自行车更进了一步，它集成电机从而是一台电动自行车。

It had a petrol engine producing 12 horsepower (8.9kw) -not much more than each of the four 6kw electric motors on Mr Piccard's Solar Impulse.

这架飞机有一个12马力(8.9千瓦)的汽油机——并不比Pic card先生的太阳脉冲号上4个6千瓦的电动机功率多。