New York's police commissioner Greg Kelley says it measures of form of natural energy emitted by people and objects known as terahertz.

纽约警察局长格雷格·凯利说，该仪器可测出人和物体散发的名为太赫兹波的自然能量。

Some think the best option is renewables – types of natural energy, such as wind and solar power, which can be replaced as quickly as they are used.

一些人认为最好的选择是可再生能源——如风能和太阳能等自然能源，用完就能迅速循环再生。