At some point, we started talking about ...

中心的な意味

話の途中で、いつの間にかある話題になった。

今回の文脈

At some point, we started talking about money.

別の文脈

At some point, we started talking about our careers.

At some point, the conversation turned to politics.

At some point, we started talking about where we wanted to live.

使える場面

会話の話題が自然に変わったことを説明するとき。

似た表現との違い

We started talking about ...：単純に「話し始めた」

At some point, ...：会話の途中で自然にそうなった

The conversation turned to ...：やや整理された説明的な表現