2022年考研英语一真题句子解析： 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.

It was also, and this is unknown even to many people well read about the period, a battle

强调句中，系动词 "was" 和表语 "a battle" 本应相邻构成 "It was also a battle"，但被长插入语 "and this is unknown even to many people well read about the period" 硬性隔开。读者需要跨越整个插入成分才能将 "was" 与 "a battle" 连接起来，识别出完整的主干结构。这种分隔增加了句子解析难度，属于典型的主谓（系表）分隔。

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.

"and" 连接两个独立的主谓结构："It was also...a battle..." 和 "this is unknown even to many people well read about the period"。前者是强调句主干，后者是完整的主系表结构，两者地位对等。"and" 在此表示补充说明的递进关系，既说明历史事实，又补充这一事实鲜为人知。

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.

强调句的核心标志是 "It was..." 框架。去掉 "It was" 和连接词后，还原为 "also a battle between those who made codes and those who broke them"，结构完整，说明这是强调句而非主语从句。此处强调的是主语 "a battle between those who made codes and those who broke them"，突出这场斗争的本质。中间插入的 "and this is unknown even to many people well read about the period" 是附加说明，不影响强调句判定。

and this is unknown even to many people well read about the period

"and this is unknown even to many people well read about the period" 整体是一个独立的完整句子，由逗号隔开，插入到强调句主干 "It was also...a battle..." 之间。这个插入成分是作者的评注说明，补充强调即使是熟悉那个时期的人也不知道这一事实。去掉此插入语后，主句 "It was also a battle between those who made codes and those who broke them" 结构完整。

well read about the period

"read" 是过去分词，与 "well" 构成复合修饰语 "well read"，作后置定语修饰前面的名词 "people"。"read" 在此表被动和完成义：这些人是被阅读（知识）的接受者，且已完成大量阅读。"about the period" 进一步限定阅读范围。这是典型的过去分词短语后置修饰名词的用法。