Definition
to speak at length about a specific topic, often causing others to become uninterested.
长篇大论，滔滔不绝
He held forth on the plan during the meeting, causing everyone to feel bored.
他在会议上长篇大论地讲述这个计划，让每个人都感到无聊。
She loves to hold forth on her travel experiences at parties, which usually makes guests gradually lose interest.
她喜欢在派对上滔滔不绝地讲述她的旅行经历，这通常让客人逐渐失去兴趣。
In class, the teacher held forth continuously, and the students began to find it hard to concentrate.
在课堂上，老师不停地长篇大论，学生们开始觉得难以集中注意力。