讲演台

例句：

1. 1.She gave a lecture on environmental protection last week.
   她上周就环境保护问题做了一次讲座。
2. 2.The teacher asked the students to give a speech on global warming.
   老师要求学生们就全球变暖发表演讲。
3. 3. He conducted a series of lectures on the history of science.
   他进行了一系列的关于科学史的讲座。