obsession
/əbˈseʃn; əb`sɛʃən/ n
~ (with/about sth/sb)
1 [U] state of being obsessed 牵挂; 惦念; 著迷; 困扰
His obsession with computers began six months ago. 他半年前就迷上了计算机了.
2 [C] thing or person that obsesses; fixed idea that fills the mind 萦绕於心的事物或人; 强迫观念
He has many obsessions. 他有许多事耿耿於怀.