主题句是一段话的中心思想。

The topic sentence is the main idea of a paragraph.

他还认为，非英语母语学生在表明中心思想前，往往使用太多情感强烈的语言和进行太多细节描述。

He also says non-native speakers generally use too much emotional language and give too many details before getting to the main idea.

一般规则是这样的，用段落的第一句话——也就是主题句，来陈述整个段落的中心思想。不要让你的读者看了文章一头雾水。

As a general rule, state the main idea of a paragraph in the first sentence--the topic sentence. Don't keep your readers guessing.

用一张图片来表达你的中心思想。

Use a picture for your central idea.

向他们的孩子解释它的中心思想。

Explain its message to their children.

一个主题是连接人物和事件的中心思想。

A theme is a central idea that connects the characters and events.

这一部分的中心思想是什么？

What is the central idea of this section?

你知道这篇文章的中心思想吗？

Do you know the central idea of this article?

存在论是这类研究的中心思想。

Ontology is its central branch.

这篇文章结构混乱，没有中心思想。

The essay is poorly organized: there is no central idea.