The main subject of this book is ancient history.（这本书的主要主题是古代历史。）

Math is my favorite subject at school.（数学是我在学校最喜欢的学科。）

We need to change the subject; this topic is too sensitive.（我们得换个话题，这个话题太敏感了。）

The professor talked about various subjects during the lecture.（教授在讲座中谈到了各种主题。）

Painting landscapes is her favorite subject for artworks.（画风景是她最喜欢的艺术创作主题。）

The subject of the meeting is to discuss the new project plan.（会议的议题是讨论新项目计划。）

English grammar can be a difficult subject to master.（英语语法可能是一门很难掌握的学科。）

They were arguing about a political subject.（他们在争论一个政治话题。）

The scientist dedicated his life to the study of this subject.（这位科学家一生致力于这个学科的研究。）

History books cover a wide range of subjects.（历史书涵盖广泛的主题。）

The subject of the experiment showed some interesting results.（实验对象呈现出一些有趣的结果。）

Let's move on to another subject; this one is getting boring.（我们换个话题吧，这个话题变得无聊了。）

Biology is a fascinating subject full of mysteries.（生物学是一门充满奥秘的迷人学科。）

The teacher divided the class into groups to discuss the subject.（老师把班级分成小组来讨论这个课题。）

The report focuses on the subject of environmental protection.（这份报告聚焦于环境保护这个主题。）

Literature offers a rich variety of subjects for exploration.（文学提供了丰富多样的主题供人探索。）

He is an expert in the subject of international relations.（他是国际关系领域的专家。）

The subject of the photo is a beautiful sunset over the ocean.（这张照片的主题是海上美丽的日落。）

We spent hours researching the subject before writing the paper.（在写论文之前，我们花了几个小时研究这个课题。）

The movie's subject matter is based on a true story.（这部电影的题材基于一个真实的故事。

）