你的裤子前裆没拉上！

Your fly is undone!

《牛津词典》

我就要买几条大短裤，那种裤腰很舒服的，带扣子的前裆的。

I just need some new boxers with a comfortable waistband and a button fly.

youdao

一个前裆拉链开着的人被视为有损尊严的，同样著名的照片也是如此，他所摆的姿势，代表了理想的美国工人形象——他刻意表现出的尊严，是永远不变的。

A man with his zipper down is undignified, and so the famous icon, posed as he is, presents an idealized version of the American worker — his dignity customized, but forever intact.

youdao