sadness和sorrow有区别为
sadness释义：
n. 悲哀悲伤，悲痛使人悲伤的事
例句：
I don't want to recall the memories tinged with sadness.
我不想回忆起那段略带悲伤的往事。
sorrow释义：
n. 悲伤懊悔伤心事
vi. 懊悔遗憾感到悲伤
vt. 为…悲痛
例句：
He likes to keep sorrows in his heart instead of pouring out.
他喜欢把伤心事放在心里不去倾诉。
