Exhaust and Emission control Systems Translations

     1)The idea is to create a structure that exposes the maximum surface area of catalystto the exhaust stream, while also minimizing the amount of catalyst required, as thematerials are extremely expensive.

    译：由于催化剂材料成本比较高，一般要求实现催化剂和排气气流接触面积的最大化，同时把催化剂数量降至最低。

    2) Emission control systems are used on cars and light trucks to reduce the amount ofharmful chemicals released into the atmosphere.

    译：排气控制系统主要用于轿车和轻型货车，减少排放到大气中的有害化学物质。

    3) A catalytic converter burns the remaining HC and CO emissions that pass into theexhaust system.  Extreme heat（700 0C）ignite these emissions and change them intoharmless carbon dioxide and water.

    译：催化转化器点燃排气条统中的HC和CO废气。废气在超高温(700摄氏度)下燃烧，转化为无害的二氧化碳和水。