Definition
A sudden occurrence or success that is attributed to luck, intelligence, or other favorable circumstances.
幸運之舉（或高明之舉）
It was a stroke of luck that he was able to find the missing document.
他能找到遺失的文件真是幸運。
Upgrading the old system to the newest version was a stroke of genius.
將舊系統升級到最新版本真是天才之舉。
Getting hired by this company was definitely a stroke of luck.
被這家公司錄用絕對是幸運。