noun · unsophisticated person from the countryside

那个人穿得很过时，看起来像个土鳖。

noun

中药方子里经常会用到土鳖。

noun · professional or entrepreneur who has never studied overseas, as opposed to a returnee (haigui)

他在招聘会上自嘲是一个土鳖，但他能力很强。