语文语法书:there area number of exemptions这个词组什么意思？

there area number of exemptions这个词组什么意思？ Area Code Pphone Number twice this century 和there is nothing of old Tokyo remaining in the downtown area. a number of the area of the football field a number of 和the number of 的区别 a number of 和the number of有何区别？ a number of 和the number of不同 a number of five ciphers a number of的用法