serendipity

It was pure serendipity that I sat next to my future business partner on that flight.

我在那趟航班上恰好坐在了未来的生意伙伴旁边，纯粹是机缘巧合。

Many great scientific discoveries were the result of serendipity rather than planned research.

许多伟大的科学发现都是意外的产物，而非计划中的研究成果。