TO ONE'S HEART'S CONTENT 尽情地 ; 尽兴地 ; 酣畅淋漓 ; 放怀
如：
Factitious what can feel suddenly sometimes sadness ,although do the thing that oneself like to also do not to one's heart's content
人为什么有时会突然觉得悲伤,即使做自己喜欢的事也不得开怀?