I was not quite satisfied with my haircut but let it go at that.我对给我理的发不很满意，但也只好算了。Let's just say that I got in a little trouble with the police, and leave it at that. = Let's let it go at that. 我们就说我和警方有点小纠葛，就说那么多吧。He said he hadn't understood the rules, and we let it go at that.他说他不懂这些规则，我们也就算了。