incidentally
adv. 顺便说一句；偶然地；附带地，伴随地
例句
Incidentally, have you heard the news about Sue?
顺便问一句，你听说过休的事了吗？
《牛津词典》
The information was only discovered incidentally.
这个信息只是偶然得到的。
"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？”
《柯林斯英汉双解大词典》
