He made a speech at the commencement.
他在毕业典礼上作了一次演讲。
commencement,本指开始，因为毕业就相当于又一个开端，所以commencement在美国英语中也可表示毕业典礼，相当于graduation ceremony。
He made a speech at the graduation ceremony.
He made a speech at the commencement.
他在毕业典礼上作了一次演讲。
commencement,本指开始，因为毕业就相当于又一个开端，所以commencement在美国英语中也可表示毕业典礼，相当于graduation ceremony。
He made a speech at the graduation ceremony.
