她漫无边际地聊了两个小时，从政治突然跳到时尚话题。

She talked ___discursively for two hours, suddenly switching from politics to fashion topics.

他漫谈式地讨论了历史、经济和环境问题，没有明确的主题。

He spoke ___discursively about history, economy, and environmental issues without a clear focus.