parenthetical

1. ADJ A parenthetical remark or section is put into something written or spoken but is not essential to it. 附加的; 插入语的[usu ADJ n]

Fox was making a long parenthetical remark about his travels on the border of the country. 福克斯正在插入一大段题外话，讲述他在该国边境游历的故事。

2. parentheticallyADV

Well, parenthetically, I was trying to quit smoking at the time. 嗯，插一句，我那时正尝试戒烟。

And what, we may ask parenthetically, does it mean?

我们想插问一句，这是什么意思？