名词
中文翻译：主题
同义词：
['subject', 'matter', 'subject matter']
例句：
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1. The teacher asked the students to choose a topic for their presentation.
老师让学生选择演讲的主题。
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2. The meeting was about the upcoming project, so we discussed different topics.
会议讨论了即将到来的项目，所以我们讨论了不同的议题。
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3. The scientist focused on the latest research findings as his main topic of discussion.
科学家专注于最新的研究成果作为他讨论的主要话题。