该标准要求改进汽车发动机和排放系统，以及使用更清洁的低硫燃料。

That will require upgrades in automobile engines and exhaust systems as well as cleaner, lower-sulfur fuels.

youdao

该标准要求改进汽车发动机和排放系统，以及使用更清洁的低硫燃料。

That will require upgrades in automobile engines and exhaust systems as well as cleaner, lower-sulfur fuels.

youdao