它们提高了燃油经济性和车辆安全性、减轻车身重量，为客户提供了愉悦的驾驶体验和附加价值。
They improve fuel economy, make the vehicle more efficient, safer and lighter, ensure a pleasurable driving experience, and provide added value to the customer.
知识经济时代的化工产品，是技术含量高、附加价值高的产品。
Chemical products of this age are of high technicality and of high additional value.
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