Fortunately is used to introduce or indicate a statement about an event or situation that is good.
例句
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。
英汉词典释义
adv.
幸运地,幸好,交好运地,吉利地; 幸亏
I was late in getting to the station, but fortunately for me, the train was late too.我到达火车站时已经迟了, 但是幸亏火车也误了点。