You must take good care of yourself.
= You must look after yourself.
译文：你必须学会照顾你自己.
解析：take good care of = look after 照顾；照看yourself后还有一个空格carefully 为副词，小心地 可有可无，修饰谓语动词注：take care of = look after 照顾；照看take good care of = look after carefully 悉心照顾