我们在咖啡馆安排了一次随意的会议，非正式地讨论项目。

We arranged a ___casual meeting at the café to discuss the project informally.

他关于天气的随意评论意外地引发了一次迷人的谈话。

His ___casual remark about the weather unexpectedly started a fascinating conversation.

那是去年夏天，我在公园和某人有一次随意的会面。

It was last summer when I had a ___casual meeting with someone in the park.