我和一位老同学一起度过了那个夜晚。

I spent the evening with an old school friend.

《柯林斯英汉双解大词典》

我要去看望我的一位老同学。

I'm going to call on one of my former classmates.

《新英汉大辞典》

他回家的路上碰到了一位老同学。

He met one of his old friends on his way home.

youdao

In this scene, he's trying to convince an old school friend of his, played by Joseph Cotten, to join this thing.

故事走向,是他试图说服一位老同学，由，Joseph，Cotten，扮演，加入这起勾当。

耶鲁公开课 - 政治哲学导论课程节选