... 淬火钢球：hardened steel ball 催化转化系统：catalytic converting system 催化箱：catalyst coontainer ...
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In Europe the trucking industry has settled on a technology called selective catalytic reduction, in which urea is periodically injected into the exhaust system to break down the NOx, converting nitrogen oxides into (somewhat) harmless ammonia.
FORBES: Clearing the Air
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