Eng: reason for...

苦衷

reason for doing something not readily understood by others (A)

擁有這些心智狀態的一個原因

reason for having these mind-states (A)

切換觀點的原因是

reason for switching points of view is (The)

那個小組之所以偶有佳作

reason for that unit's occasional outstanding successes (The)