我阅读了关于年长母亲的讨论串。

I read the ___thread about older mothers.

关于气候变化的讨论串引发了用户之间的激烈辩论。

The ___thread on climate change sparked a heated debate among users.

她发起了一个新讨论串来讨论最新电影的上映。

She started a new ___thread to discuss the latest movie release.