Smog,once an urban annoyance,is now recognized as a health risk,and the automobile has been pinpointed as the principal culprit.是什么意思_Smog,once an urban annoyance,is now recognized as a health risk,and the automobile has been pinpointed as the principal culprit.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句