Roughly speaking , we receive about fifty letters a week on the subject.

关于这个问题，粗略地说，我们每周能收到大约五十封来信。

《牛津词典》

The introduction should give at least four pieces of information: what is the topic, why this subject, who is speaking, and why this speaker.

介绍词应至少包含四方面的信息：主题是什么；为何选这一主题；主讲人是谁；为何由他主讲。

youdao

We’ve become accustomed to the habit of thinking and speaking in terms of a subject, a self.

我们已经形成了思考和说话加主语的习惯，一个自我。

youdao

Now speaking of teenagers, they were the subject of another new study.

VOA: special.2010.07.07

However, you only use this when the other person has been directly discussing, speaking on a subject.

但是，只有当他人在直接谈论某一话题时，你才能使用这个句型。

It sounds like 课堂 - SpeakingMax英语口语达人

The goal of minimizing the possibility of nuclear war is not served when the U.S. president, in speaking of the subject, appears disconnected from reality.

CENTERFORSECURITYPOLICY: Obama��s ��Nuclear Zero�� Rhetoric is Dangerous

Here are Hillary Clinton and Obama speaking about the same subject, preventive care.

NEWYORKER: The Conciliator

During the Quiet Period, all of the Business Outlook and other forward-looking statements disclosed in the company's news releases and filings with the SEC should be considered as historical, speaking as of prior to the Quiet Period only and not subject to an update by the company.

ENGADGET: Intel posts Q4 2012 earnings: $2.5 billion in profit on $13.5 billion in revenue