他将就濒危物种作个讲座。

He will deliver a lecture on endangered species.

当晚的来宾可以拿到讲座的文稿。

The text of the lecture was available to guests on the night.

这些讲座有一半是他做的。

Half of the lectures are delivered by him.

他作了现代艺术的系列讲座。

He gave a series of lectures on modern art.

这本书是在去年所作的一个讲座基础上扩写而成的。

The book is an expansion of a lecture given last year.