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If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake.
如果我们驾驶的是纯氢汽车，这种汽车实际上会帮助净化空气，因为从排气口出来的空气会比进入发动机进气口的空气更干净。