437　lecture和address

① lecture（a formal talk on a serious or specialist subject given to a group of people）演讲，讲座（指正式、认真就某个专题给听众做的演讲）；也表示“（大学里的）授课”。

There will be a series of lectures on philosophy in the coming weeks. 在未来几周，将有一系列有关哲学的演讲。

They could not follow the lecture. 他们听不懂这次讲课。

② address（a speech，esp. one that has been formally prepared，made to a group of people，gathered especially to listen）演讲（特别指正式为某些专门听讲的人准备的演讲）。

The visiting president made a television address yesterday. 昨天，来访的总统发表了电视讲话。