to hold forth
[phrase form: hold]
01
长篇大论, 高谈阔论
to talk at length about a topic, often in a manner that others might find uninteresting or boring
例子
The professor held forth on the intricacies of quantum physics, losing most of the class within minutes.
教授滔滔不绝地讲述量子物理学的复杂性，几分钟内就让大部分学生失去了兴趣。
