三年级上册英语一二单元思维导图(20)张

This is a request to summarize the contents of a document titled "三年级上册英语一二单元思维导图" (Third Grade Upper Semester English Units 1 & 2 Mind Map) within 200 characters, while also specifying that the summary should be stylistically diverse and avoid using any modern slang. The request also explicitly states that the summary should be provided directly, without any preamble. Here's an attempt at fulfilling the request: 英语一二单元核心词汇与句型，图示清晰，便于三年级学生理解掌握基础语法及常用表达。