So it's either dumb luck, or a set up.

所以这要么是走狗屎运，要么就是一个陷阱。

And if it was just plain dumb luck, that was fine with me.

即使那“只是憨运”，这感觉也不错。

Coverage-adequate tests will find some of these bugs, by sheer dumb luck, but not enough of them.

覆盖率足够的测试会发现这些bug 中的一部分，全靠运气，但发现得还不够多。