话题的英文：
subject
topic

参考例句：

He lugged the subject in.
他硬把那话题扯进去。

Their engagement is the talk of the town.
他们订婚的事成了镇上谈论的话题。

He searched for a topic which would warm her office impersonality into friendliness
他想找一个话题，使她一本正经的态度变得友好一点。

He had theories about almost any subject under the sun, including vegetarianism the drama, politics, and music
他谈论的话题包罗万象:素食主义，戏剧，政治和音乐

How to keep fit is an eternal topic of diversity and controversy.
怎样保持健康是一个永恒的、充满差异和争议的话题。

His inexplicable debts were a byword in his circle
他那些来历不明的借款成为那圈子里人议论的话题。

The story begins with a local eddy in the swirling gas and dust of the primordial galaxy
话题要从原始星系的旋涡气体和尘埃形成的一个局部涡流说起。

What was I thinking of, picking a wacky subject like cryonics?
我当初到底是怎么想的——竟然挑了一个人体冷冻术这样的古怪话题？

Since global warming received its Hollywood makeover, such talk has stirred up controversy in scientific circles
自从全球变暖经过好莱坞电影翻新再现，天气这个话题引起了科学界的争议。

In printing, an unbound treatise on a subject or current topic of interest
在印刷技术中,关于某个主题或目前感兴趣话题的一种未装订成书的论文。

subject是什么意思：
n. 主题；话题；学科；主语；国民
adj. 易遭受…的；服从的；受制于…的；统治下的
v. 使…隶属；使屈从于；提供

optional subjects
选修科目

It is a mythical subject.
这是个虚构的主题。

a survey of the situation, subject
对情况、 问题的概括论述

The tense used is decided by the subject.
所用的时态取决于主语。

To subject to the process of division.
除法依除法的过程而定

topic是什么意思：
n. 论题；话题；主题；题目

This is a favorite topic.
这是个大家爱谈论的话题。

That is a favorite topic.
那是个大家爱谈论的话题。

Expand on a favorite topic.
详述一个感兴趣的论题

They discussed the weather and other topics.
他们讨论了气候和其他的话题。

relating to or constituting a topic of discourse.
关于论文的主题，或组成论文的主题。