短语讲解：

1. In other words, they think about the past in a dreamy way – a little happy and a little sad.

in other words 换句话说; 就是说
例句：In other words, frictional work is not completely recoverable.
换句话说，摩擦力的功不能完全回收。

2. When two former lovers – high school sweethearts, perhaps? – meet in a grocery store, they talk about old times and wonder what might have been.

talk about 讨论，谈论
例句：He went on to talk about his accident.
他接着谈到了他的意外事故。