Asked what the new treaty means for U.S-Russia cooperation on the Iranian nuclear issue, Secretary Clinton referred to recent in depth consultations.

VOA: standard.2010.03.26

Our third example for using the "That's what" pattern is when you explain a specific point about a larger issue.

使用 "That's what" 的第三种情况，是解释一个大问题中的特定方面。

That's what课堂 - SpeakingMax英语口语达人