![Whenthetrafficlightsturnred,wewillstopdrivingacarorcros...]( "Whenthetrafficlightsturnred,wewillstopdrivingacarorcros...")
- 问题详情：Whenthetrafficlightsturnred,wewillstopdrivingacarorcrossingastreet.Whyisredusedfortrafficlightsinsteadofothercolors?Asweknow,scattering(散*)happenswhenlightgoesthroughtheair.Forthesamemedia(媒介),ifthewavelengthislong,thescatteringwillbeshort...
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