by chance

副词 by chance:

1. in an incidental manner
   同义词：incidentally, accidentally
2. through chance, "To sleep, perchance to dream.."
   同义词：perchance
3. by accident
   同义词：haply, by luck
4. without advance planning
   同义词：accidentally, circumstantially, unexpectedly

1. I met her quite by chance.
   我遇见她完全是偶然的。
2. Occurring by chance; fortuitous.
   侥幸的碰巧发生的，幸运的
3. We met (each other) quite by chance.
   我们(彼此)相遇纯属偶然。
4. He had a slip of tongue by chance.
   他偶然说走嘴。
5. She tried to commit suicide, but we saved her life by chance.
   她试图自杀，但我们碰巧救了她。