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

More generally speaking, we might say, they're subject to deterministic laws... that, as physical objects, it's true of them that they must do what the laws of physics and laws of nature require that they do.

我们甚至可以这样说,它们受制于决定性的法则,即,作为物理实体,它们必须按照,物理定律和自然法则的要求去做

耶鲁公开课 - 死亡课程节选

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

Across the English-speaking Caribbean, work for foreigners is a touchy subject.

ECONOMIST: Importing Asian energy

He claimed his client had not been read his rights when first speaking with the FBI, nor was told he was the subject of an investigation.

BBC: Die Hard director John McTiernan given jail term

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