例句與造句

1. Before gaining independence in 1991, all Soviet republics had to use the Russian air navigation information service based in Moscow.
2. As a service to GPS users, the Department of Transportation has established the " Navigation Information Service " ( formerly " GPS Information Service " ) as a point of contact for civil GPS users.
3. It's difficult to find navigation information service in a sentence. 用navigation information service造句挺難的