In a Nutshell: Imagine a bucket that's supposed to hold water, but has a small, overlooked hole in it. That hole is a `漏洞`. The concept applies to anything that should be solid, sealed, or complete but has a gap. This could be a flaw in a software program that lets hackers in, a gap in the law that lets someone avoid taxes, or a weak point in an argument that makes it unconvincing. It's the “gap in the armor” of a system, plan, or object.