短语讲解：

1. Lee learned to speak with the accent of a person from the southern part of the U.S.

speak with 和…谈话，和…商量
例句：May I speak with Mr. Chen, please?
可以请陈先生听电话吗？

2. She even uses the southern slang term “y’all,” which southerners use to refer to anyone they are speaking to.

refer to 参考; 指的是; 涉及; 适用于
例句：Writers often refer to a dictionary.
作家时常参考字典。

3. The Dorseys even agreed to host her for the next four years after she earned a full scholarship for her undergraduate studies.

agree to 同意， 赞成， 同意照办
例句：They agree to the plan in principle.
他们原则上同意这个计划。