His account of the fire accident includes a lot of extraneous details.

他对失火事件描述含有大量离题细节。

This is meant to be a discussion course.One factor that will legislate against this aim is the instructor's digressive wordiness.

这表示本课程将以讨式进行，设此目标原因之一，为避免本人讲课聒噪，常离题。