# arch_entry
the interface for receive client request.
# arch_bridge
core module: receive request from arch_entry; request basic data plat, choose best result and return back to client.
--- # rank_module
for choosing a best result.
# srv_user_info
include basic, and social information of users.
separate by type.
# srv_reality_region
include basic information of city and scenic region
include portrayal of city and scenic-region;
# srv_user_account
store user account information
# srv_thirdparty_resource
for requesting thirdparty resources .