Jealousy is the feeling that someone else has something that rightfully belongs to you.嫉妒是觉得别人拥有本该属于你的东西。

She's inherited the money which is rightfully hers.她继承了本应属于她的钱。

Killing a police officer is something that's taken very seriously and rightfully so.弑警被视为非常严重的罪行, 而且理应如此。