Main idea （尤指用一句来概括的）中心思想，中心主旨，大意。
1. It is quite easy to summarize the main idea of this passage.
总结一下这段文章的大意很容易。
2. Can you tell me what is the main idea of this article?
能告诉我此文的中心意思吗？
3. Try to understand the theme and the main idea of the movie.
试着理解片子的主题和大意。
4. The purpose, theme or main idea of this Web project is not clearly stated or may be vague.
这个网页专题研究计划的目的、主题，或主要构想的叙述不清或模糊。
Theme（长篇著述或一系列独立讨论等的）题目，主题，主题思想，如:
5. The novel's central theme is the perennial conflict between men and women.
小说的主题是男人和女人之间永无休止的冲突。
6. The theme of the conference is renaissance Europe.
大会的主题是文艺复兴时期的欧洲。
