This is the central topic of this paper.
这是本文的中心议题。
Language transfer has long been a central topic in Second Language Acquisition.
语言迁移一直是二语习得研究的中心问题。
The central circle represents a conceptual topic (such as Security), which
中央的圆圈代表概念题目（例如Security），它
The paragraph should contain only one central idea. this can be stated in a topic sentence.
一个段落只能表达一个中心思想，往往在主题句中提及。
The central theme is usually summarized in what is called the topic sentence.
中心议题通常被概括地称为主题句。
The central theme is usually summarized in what is called the topic sentence.
中心议题通常被概括地称为主题句。
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