n.不幸;灾难
A series of mischance happened. 一连串不幸的事发生了。
I lost your file by pure mischance. 我把你的文件丢了,纯粹是碰上倒霉事了。
Only a serious mischance will prevent him from arriving tomorrow. 只有碰上极倒霉的意外变故,他明天才会来不了。