incidentally

"I didn't ask you to come. Incidentally, why have you come?"

“我没有叫你来。顺便问一下，你为什么来呢？”

The information was only discovered incidentally.

这个信息只是偶然得到的。

Without grandchildren around, it's possible to have a conversation with your kids, who incidentally would have more time for their own parents.

我们会提醒有可能这样的祖父母——没有孙子在身边，你可以和你的孩子交谈，他们碰巧会有更多的时间陪伴自己的父母。

The letter mentioned my great aunt and uncle only incidentally.

信里只是附带地提到我的叔祖母和叔祖父。

They incidentally annoy their friends.

他们顺便惹恼了他们的朋友。