搭配 “a stroke of luck” 指 “意料之外、无从预测但结果却有利的情况或事件”。

例句
After my car broke down, my friend drove past and helped. It was a stroke of luck she was driving down the same road.
我的车抛锚后，我朋友正巧开车路过帮了忙。真是走运，当时她刚好沿同一条路开过。

Finding this job right after my contract ended was a stroke of luck.
我的上一份工作合同刚结束，就找到了这份工作，真是幸运。

I was running late, but the train was also delayed, so I managed to catch it. What a stroke of luck!
那天我晚了，但火车也晚点了，我这才赶上车。真是运气好！