demons
A demon is an evil spirit.
a woman possessed by demons.
一个被魔鬼附身的女人。
If you approve of someone because they are very skilled at what they do or because they do it energetically, you can say that they do it like a demon.
She worked like a demon and expected everybody else to do the same.
她工作起来精力过人,而且希望其他人也都是这个样子。
He is a demon organizer.
他是一位超强的组织者。