他将要就社区治安计划这一主题向我们发表演说。
On the subject of space walks, for example, audiences vary in their interests and how much complexity they can comprehend.在太空行走这个主题上,观众的兴趣不同,能理解的复杂程度也不同。
Evelyn was very voluble on the subject of women's rights.伊夫林谈起女权这个话题口若悬河。