obsession

n.[U]痴迷；困扰,成见
[C]使人痴迷的的人（或物）

Her commitment to a great cause degenerated from a crusade into an obsession.

她致力於一伟大事业, 但其崇高的奋斗精神已变质成为偏执的狂热.

Caused or conditioned by compulsion or obsession.

强迫的由强迫或压制所引起或制约的