that's only the first two letters of the alphabet在下文中是什么意思?是

that's only the first two letters of the alphabet在下文中是什么意思?是一种比喻用法吗(前文在讲FALMOUTH地方为文学界贡献了许多作家和作品.) George Alagiah,Kate Adie,Beryl Bainbridge,Melvyn Bragg,Louis de Bernieres...and that's only the first two letters of the alphabet.(In fairness the remaining 24 letters aren't quite as strongly represented but even so.)