1、魔鬼。
举例：Anyway, grappling with these demons on this night, I couldn't sleep.
不管怎么说，由于那一晚同那些魔鬼斗争，我无法入睡。
2、恶魔。
举例：He was seen as a demon, determined to hand the country over to the reactionaries.
他被看成一个执意要将国家交给反动分子的恶魔。
3、精力充沛。
举例：Her husband is a demon for work.
她丈夫工作起来精力过人。
4、高手。
举例：She's a demon at chess.
她是象棋高手。