Beijing is to roll out toughest automobile emission standards.
北京将推出最严格的汽车尾气排放标准。
Automobile exhaust gas emission standards are more stringent, which need better material than before.
越来越严格的汽车尾气排放标准对用于尾气净化的材料提出了更高的要求。
Automobile exhaust gas emission standards are more stringent, which need better material than before.
越来越严格的汽车尾气排放标准对用于尾气净化的材料提出了更高的要求。
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