尽管北美汽车业所用的40种塑料都可以循环利用，但分离和清洁塑料的需要导致循环利用的成本比使用全新塑料树脂更高。
Although all 40 kinds of plastics used in a North American automobile can be recycled, the need to separate and clean them makes using them more expensive than using virgin plastic resins.