求翻译：虽然现在汽油里都已添加清净剂，但对于一些进口车和汽缸压缩比高的车来说，国内的油品还是达不到要求，质量参差不齐，大小加油站也有区别。质量差的汽油里的铅含量高不仅会损害喷油嘴，也会令三元催化器失效，排出的废气就会有毒。是什么意思？

Gasoline have to add detergent, domestic oil or fail to meet requirements for imported cars and cylinder compression ratio car, of varying quality, size and gas stations are different. High lead levels in the poor quality gasoline will not only damage the fuel injectors, will also cause the catalyti