In that case: means ‘taking that into consideration’. You say ‘in that case’ or ‘in which case’ to refer to a situation which has just been mentioned and to introduce a statement or suggestion that is a consequence of it. As in You’re leaving? In that case, I’m leaving too.

中文释义：那样的话。in that case的用法：用于句首，表示接下来所说的话是前面谈论的事情的一个承接，与之前的讨论是相互依存的关系，没有特殊的含义。在句子中起到承上启下的关系。例句：In that case, we won’t wait any longer. （那我们就不再等了。）

看美剧学英语高频短语：In that case