City skylines are not criss-crossed with grids of laser beams because it is all done using invisible infra-red light, says Mr O 'brien.
O ' Brien先生说，城市高楼大厦之间并非激光束往来交错，因为这一技术使用的都是红外光。
City skylines are not criss-crossed with grids of laser beams because it is all done using invisible infra-red light, says Mr O 'brien.
O ' Brien先生说，城市高楼大厦之间并非激光束往来交错，因为这一技术使用的都是红外光。
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