It was also, and this is unknown even to many people well read about the period, a battle between those who made codes and those who broke them.一、语法结构剖析1、找出谓语动词It was also, and this is unknown even to many people well read about the period, a battle between those who made codes and those who broke them.2、划出句子结构Itwas also, {and thisisunknown[even to many people(well read about the period)]}, a battle(between those(whomadecodes)and those(whobrokethem)).[主干]It was also a battle.“这也是一场较量”|--[插入语]and this is unknown “并且这并不为人所知” |--[让步状语]even to many people“即便对于许多人” |--[定语]well read about the period 过去分词做后置定语修饰people“熟读这段历史时期”|--[定语]between those and those “在他们与他们之间” |--[定语从句1] who made codes “那些制作编码的人” |--[定语从句2] who broke them “那些破译密码的人”二、词汇含义1、battle 较量2、who made codes 编码者3、who broke them 破译者三、“得意忘形”这也是编码者和破译者之间的一场较量。而这一点即便是那些熟读这段历史的人来说,也并不知情。