Fortunately, the weather that winter was reasonably mild.

幸好那个冬天还算暖和。

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。

Bombs had hit the building a number of times but fortunately no one was hurt.

炸弹几次袭击这幢大楼，但幸运的是没有人受伤。