be based on “以……为根据”； “根据……”；“基于……”用法是A be based on B
① What he said is based on fact.他所说的话是以事实为根据的.
② The story is based on real life.那故事是根据现实生活而写的.
③ Some modern languages are based on Latin.在些现代语言是以拉丁文为基础的.
be based in = be located in “ 位于”；用法 sth be based in swh
He is a founding partner of the league based in New York City.他是那个位于纽约的联盟的组成成员之一.