该相机聚焦设备的优点是结构简单，安装方便，生产成本低。
The camera lens focalizer has the advantages of simple structure, convenient installation and low production cost.
他们一起设计了无线心脏起搏器wireless cardiac-stimulation (WiCS) device，该设备通过超声波进行聚焦，刺激位于心脏内米粒大小的微型接受器。
Together they have devised a wireless cardiac-stimulation (WiCS) device that uses focused ultrasound to stimulate a tiny receiver device, the size of a grain of rice, placed within the heart.
第二种可能性则能应用在更加耗电的设备上。其原理是发射一道精确聚焦的红外激光线，击中光伏电池，由此能够将光束转换回电能。
A second possibility, for more power-hungry devices, is to fire a finely focused infrared laser beam at a photovoltaic cell, which converts the beam back to electrical energy.
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