你好，很高兴为你解答。Experience is that kind of stuff (that) every human has gained since ( he was) born.经验嘛，就是每个人天生就具有的那么一种东西。【解析】：
experience 是主语 ，is 是系动词，that kind of stuff 是表语，every human has gained since ( he was) born 是做 stuff 的后置定语，省略了that ，that在定语从句里面充当宾语，可省。since 后面也省了 he was，因为since后面的主语和 定语从句里的主语every human 是一致的。...
