Audi will debut an A4 with a fuel-saving stop-start system and a new diesel engine that uses a chemical additive to reduce nitrogen oxide emissions.是什么意思_Audi will debut an A4 with a fuel-saving stop-start system and a new diesel engine that uses a chemical additive to reduce nitrogen oxide emissions.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句