误；
偶然地；
不经意；
例句：
She discovered the problem by accident. 她碰巧发现了这个问题。
He sliced ( into) his fingers by accident when cutting vegetables.他切菜时不小心切着了手指头。
The other day I met her by accident. 前几天我偶然遇到了她。
She arrived just as we were leaving, but whether this was by accident or by design, I'm notsure.她刚好在我们正要离开时到达，但我不能肯定这是出于偶然还是有意安排。
We met together by accident. 我们偶然相会。