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。