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.

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。

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Their social spending is skewed towards old-age pensions, and employment policies are focused on making it hard to fire people already in work.

他们的社会支出偏重于养老金，就业政策着力保障在职员工不易被解雇。

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With a magnifying glass, the rays of the sun can be focused to set grass or paper on fire.

用一面放大镜可以凝聚太阳光，而点燃和纸张。

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After the Rhode Island fire, changes in fire codes focused on the need for fire suppression systems.

CNN: Be ready for emergency at a crowded public gathering

The test focused more on the smoke hazard from a fire than the damage caused by flames.

WSJ: Dreamliner-Like Batteries Raised Concerns

As Craig Venter's Celera Genomics caught fire, Millennium looked like a more business-focused venture, with a clearer plan to profit.

FORBES: Biotech Battle Scars