If the topic changes, change the subject line to match it.

如果邮件中所谈的主题变了，改变标题使其匹配。

youdao

A topic change is a kind of adaption to the social norms and psychological world.

话题转换现象是对社会规约和心理世界的一种顺应。

youdao

Chapter IVdeals with topic change, which is divided into two types: linguistic change and zero change.

话题转换可以分成言语性转换和零形式转换两种。

youdao

Ok, double line. If there are no questions I'm going to make a dramatic change in topic.

好的，这是重点，如果没什么问题,我要讲下面的内容。

麻省理工公开课 - 计算机科学及编程导论课程节选

The topic is radical change that will occur as a result of offshoring.

FORBES: Anxiety in The Age of Prosperity

One thing for sure is that it isn't designed to produce consensus around such a complex topic as climate change.

BBC: Harrabin's Notes: Debating the IPCC

No doubt, the topic of climate change is contentious and some scientists are unable to make the link between global warming and human activity.

FORBES: Hurricane Sandy May Turn the Tide on Climate Change