Using headings: If you are writing long posts, break up the sections by using headings, small titles to highlight a change of subject.

使用标题：如果你写一篇很长的文章，通过使用标题，将文章划分为一些部分，用小标题来突出主题的改变。

youdao

Whether you can successfully change your personality as an adult is the subject of a longstanding psychological debate.

作为一个成年人，你能否成功地改变自己的个性是一个心理学长期争论的话题。

youdao

Be sure you don't change the subject in the middle of a paragraph, and be sure that everything under one heading in your outline is about the same general topic.

确定你并没有在段落途中改变主题，同时也确定在你的大纲中那些属于同个标题的内容都关乎同个主题。

youdao

One resolution was approved a declaration calling for concerted global action on climate change ahead of a major United Nations conference on the subject scheduled for December in Copenhagen.

VOA: standard.2009.10.17

I only had one year left of university, it was too late to, to change from... to a too different subject,

我还有一年就要毕业，所以已经来不及换专业了，

换专业的理由 - SpeakingMax英语口语达人

Summly also provides a change of subject for the lead story on Yahoo its February 2013 announcement that by June all its work-at-homers must report into the office every day or find work elsewhere.

FORBES: Marissa Mayer Gives 17-Year-Old Brit a $30 Million Payday

"The branch has been identified as one that could potentially be partnered with a retailer between the autumn of this year and spring of 2015, with any change being subject to a six week public consultation to gather the views of the local community, " said a spokesperson for the Post Office.

BBC: Carmarthen post office: Rally over 'shop move' worry

The title of the race was the subject of a last-minute name change, having originally been called the less glamorous sounding Ilkley Handicap Chase, after the West Yorkshire town.

BBC: Racing pundit John McCririck