英语语法：懂--后置定语+独立主格——的请速进!
A gravy train would be a really good situation financially,something either that making you a lot of money,or that allowing you to spend a lot money.
重点在后半句：
如果此句是独立主格结构,that 在那里做什么?
如果不是独立主格,that 引导定语从句,后面岂不是只有一个名词 something?
A gravy train means 轻易发大财的工作，美差
我好像懂了。that是个代词，为什么要加个代词？