(that's) a likely story!

likely adj.

If something is likely, it will probably happen or is expected.

很可能的，可能要发生的

Do remind me because I'm likely to forget.

一定要提醒我，因为我可能会忘记。

said when you do not believe something

听起来像真的一样!真会编故事!

A: He said he bought them all very cheaply from some guy he knows.

他说那些都是他从一个熟人那里低价买来的。

B: That's a likely story!

说得像真的似的!