On the whole, topic-comment sentences, the main sentence type in Chinese, are led by topic and based on mainly a single-track system-meaning.

总体来说，主题句是主题统领下的、近乎语义单轨的结构，是汉语的主要句型。

youdao

This paper presents a corpus study of two topic-comment constructions, namely topicalization (top) and left-dislocation (LD) in the Beijing dialect.

本文采用语料分析的方法，研究了话题化和左失位两个基本话题结构在北京话口语中的使用情况。

youdao

Considering all these differences in sentence structure, translators find switching subject-predicate into topic-comment sentences is often necessary but difficult in English-Chinese translation.

由于英汉语在句子结构上的巨大差异，英汉翻译中，句式转换通常是必要的但也是十分困难的一个环节。

youdao

Voting is an expression of how germane to the topic a comment is.

WHITEHOUSE: PCAST Launches Policy Forum on the Future of U.S. Advanced Manufacturing | The White House

Pregnancy in the 21st century isn't just about piling on pounds - again a constant topic of public comment - it's about piling on guilt too.

BBC: NEWS | UK | Confused, guilty and pregnant

It is most disturbing that in the eyes of some who comment on this topic in the media, a tone is taken that gives the appearance that these people do not deserve access to safe and effective FDA approved medications.

FORBES: 5 Deadliest Diet Trends: Pills That Really Can Kill