welcome to the London Underground,or as it is commonly known,the tube.
问题描述：
welcome to the London Underground,or as it is commonly known,the tube.
在这个句子里面or是连词啊.as也是连词吧?那么这个地方怎么出现了两个连词呢?不是一个连词就可以连接句子吗?
答
一、为了便于理解,先整理如下：Welcome to the London Underground,or the tube ...,as it is commonly known.欢迎来到伦敦地铁,否则该地铁线路就...,由于这一点是众所周知的.二、分析：这个句子是并列复合句：并列...