为一个项目决定一个主题是困难的。

Deciding on a topic for a project is difficult.

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这种对潜在危险的恐惧，成为了一个大型摄影项目的主题。

This fear of a looming danger became the subject of a large-scale photo project.

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讨论的主题包括对森林破坏的协同研究，如何扑灭森林火灾，以及关于森林生态系统的欧洲研究项目的扩展。

The topics discussed included the co-ordinated study of the destruction of forests, as well as how to combat forest fires and the extension of European research programs on the forest ecosystem.

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So that's 9 potential final projects that can live on in telephone form toward semester's end.

就电话这一主题我们就有9个,潜在的项目可以去做。

哈佛公开课 - 计算机科学课程节选