a stroke of luck

例句：

1. 1.I've been waiting for this break in my career for years, and now it's finally happened.
   多年来我一直在等待职业上的突破，现在终于实现了。
2. 2.She was so lucky to win the lottery jackpot.
   她非常幸运地赢得了彩票大奖。
3. 3.He had a stroke of luck when he stumbled upon a hidden treasure chest.
   他偶然发现了一个隐藏的宝箱，这真是一次难得的好运。