I was late, but fortunately the meeting hadn't started.
我迟到了，不过幸好会议还没有开始。
Fortunately, common sense prevailed.
幸而理智占了上风。
Fortunately for me, my friend saw that something was seriously wrong
对我来说幸运的是，我的朋友发现了非常严重的错误。
Luckily, I'd noticed where you left the car
幸运的是我注意到了你把车停在哪里。
Luckily, Nancy's father and her attorney were one and the same person
幸运的.是，南希的父亲就是她的律师。