be a member of与become a member of的区别

be a member of与become a member of的区别 a member of与the member of的区别 become a member和be a member的区别 join/join in/attend/be a member of的区别 is a member of become member of=? China has become a member of the world community it has become a member of ous family a member of的用法,怎么用? a member of snoopy club ____（be) your sister a member of the reading club how can I be a member of vampire?