Until now, they explained, an external source of electricity was required in order to power the process.
但是目前还需要提供外部电源来启动这个过程。
Experts fear that Britain is relying too much on wind as a power source when other technologies are required in calm weather.
有专家担心，其他技术要求大气平稳时，英国却过度依赖风力作为其能源。
Having initially connected the ornithopter using a DC power source, they realized that the device could lift 1.5 grams of payload, which was roughly the mass of the batteries required for flight.
起初给扑翼机接上一个直流电源之后，他们发现这个装置的有效载荷为1.5g，这大概可以勉强提起飞行所需的电池。
This design involved the automatic delivery system comprising client and server hardware, and required no visible change to water dispenser, no extra indoor wires or power source.
设计了包括客户端硬件和服务器端在内的自动配送系统，不改变饮水机外观，避免室内布线并无需额外电源。
The companys products convert and control raw electrical power from any central, distributed, renewable, or backup power source into high-quality power required by electronic and electrical equipment.
该公司的产品从任何转换和控制中心，分布式，可再生，或将电子和电气设备需要高品质的电源备用电源原料的电力。
The experiment shows that the operation of TIG power source which controlled by microcomputer is steady and reliable, and the required precision has been reached.
经过实际焊接工艺试验，证明该系统运行稳定、可靠，达到了所要求的控制精度。
Experimental result shows that the method makes the operating voltage of electric-light source maintained at the range required voltage level of power saving.
实验证明，该方法使电光源的工作电压基本保持在所要求的节电等级的电压范围内。
Railroad signal power system is a special supply power source for train running. The high reliability is required. Thus, its supervisor and control become very important.
铁路信号电源系统是专门给列车运营信号供电的，其可靠性要求非常高，因此，对铁路信号电源的监视和控制十分重要。
The prior steering lamp is characterized in that a power source for rotating the lamp is required, and the prior steering lamp is not associated with the speed.
现有转向车灯特点：需一个用来使车灯转动的动力来源，都与速度没关系。
The only power source is a hydraulic system to provide generator with required hydraulic fluid flow at demanded pressure.
驱动它运转的唯一动力是所需要的液压流量及压力。
The only power source is a hydraulic system to provide generator with required hydraulic fluid flow at demanded pressure.
驱动它运转的唯一动力是所需要的液压流量及压力。
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