In a way it is like a long-range version of the radio-frequency bar codes used by cars passing through the pay booths of automated toll roads or to tag some goods in shops.
在某种程度上，这种方式类似于远程的公路自动收费站所使用的车载射频条码或是商店货物条形码。
2
This could be used like an optoacoustic version of the radio-frequency bar codes that are used by cars passing through the pay booths of automated toll roads or to tag some goods in shops.