国产高清精品免费区-男女一进一出抽搐免费视频-中日韩一二三级黄色永久视频-日韩精品人妻一区二区免费视频-日本久久视频在线观看-99热这里只有精品88热-亚洲韩国黄色最新短视频一区-日韩伦理在线观看免费全集-国产av一区二区三区天堂

quick question

A question that usually requires a long answer. A close relative of [stupid question] and [rhetorical question].
> Joan: I have a quick question for you. How do you solve for "x" in this complex differential equation?
> Bob: Uhhhhhh...