释义：
Let's ( just ) say 就当成，假定......
这次为 Let me say 中的 me 被 us 取代的情况，经常会缩略为 Let's say,表示“假设......”，用于举例子或作假设。say 后面主要接具体从句，但有时也可以接名词。
例句：
Let's say I bought a really great pair of shoes.
假设我买了一双非常棒的皮鞋。
Let's say we do.
假设我们做。
Let's say she didn't break the window. Who did?
如果她没打破窗户，那是谁干的？
Let's say we leave him here. What will happen?
假设我们把他留在这里，会发生什么事情？
对话：
A: Is Cheryl really going to get divorced?
谢丽尔真要离婚吗？
B: Let's just say she doesn't live with her husband.
假设她不和她丈夫一起住。
