搭配 「a stroke of luck」 指 「意料之外、無從預測但結果卻有利的情況或事件」。
After my car broke down, my friend drove past and helped. It was a stroke of luck she was driving down the same road.
Finding this job right after my contract ended was a stroke of luck.
I was running late, but the train was also delayed, so I managed to catch it. What a stroke of luck!