most desirable things in life have to be "earned" -that is,

问题描述:

most desirable things in life have to be "earned" -that is,
怎么翻译,尤其是最后的that is 怎么翻译

在生命中你最渴望的东西必须你自己去争取,
that is =也就是说.你后面应该还有个句子吧,是用来承接后面那个句子的