I count myself lucky to have known him.
和他相識，我覺得很幸運。
I'm lucky in that I've got four sisters.
我很幸運，因為我有四個姐妹。
Luckily there was a taxi rank nearby.
幸好附近有個出租車候客處。
Luckily, my mother rose to the occasion.
幸好，我母親挺身而出作了處置。
He's been very unlucky that no chances have fallen to him.
他很不走運，沒有任何機會落到他身上。