If you refer to a long speech by one person during a conversation as a monologue, you mean it prevents other people from talking or expressing their opinions.
例句
Morris ignored the question and continued his monologue.莫里斯不理會這個問題，繼續他的長篇大論。
N-VAR
長篇獨白;獨角戲
A monologue is a long speech which is spoken by one person as an entertainment, or as part of an entertainment such as a play.
例句
...a monologue based on the writing of Quentin Crisp.根據昆廷·克里斯普的作品改編的獨角戲
英漢詞典釋義
n.
(戲劇)長篇獨白
The comedian gave a long monologue of jokes.喜劇演員講了一長段由笑話組成的獨白。
滔滔不絕的講話
He went into a long monologue.他一個人滔滔不絕地講話。
英英詞典釋義
Noun
1. speech you make to yourself
2. a long utterance by one person (especially one that prevents others from participating in the conversation)
3. a (usually long) dramatic speech by a single actor