But sometimes we use backside to be a little more polite.

但有时我们用臀部是为了更礼貌一点。

More likely offering your backside to the Thespians.

似乎更像是你冲到后面泰斯庇人堆里去了。

It's a small, rectangular piece of thick paper, usually with a photograph on one side and room on the backside to write a short message and the address of the person you are sending it to.

这是一张长方形的小厚纸，通常一面有照片， 背面有空间用于写一条短消息和收件人的地址。