a million dollar question什么意思?Just how Canada's immigration backlog ballooned to almost one million applications today is indeed a million dollar question.请问上句a million dollar question是什么意思?

a million dollar question什么意思?Just how Canada's immigration backlog ballooned to almost one million applications today is indeed a million dollar question.请问上句a million dollar question是什么意思?
a million dollar question什么意思?
Just how Canada's immigration backlog ballooned to almost one million applications today is indeed a million dollar question.
请问上句a million dollar question是什么意思?

a million dollar question什么意思?Just how Canada's immigration backlog ballooned to almost one million applications today is indeed a million dollar question.请问上句a million dollar question是什么意思?
意思就是:一个价值百万美元的问题
句子整体含义就是指当初加拿大那么一点点移民是如何膨胀到今天已经有近100万的申请者,这个问题很难解释.

成千上万个问题的意思。

难以回答的问题
很难找到回答

a million dollar question = 一个很难回答的问题

加拿大那么一点点移民是如何膨胀到今天已经有近100万的申请者，这个问题很难解释。