Translation of "Backs" in Chinese

You shouldn't talk about people behind their backs.

你不應該在背後說別人的壞話。

We must not speak ill of others behind their backs.

我們不應該在背後說別人的壞話。

It is not manly to speak ill of others behind their backs.

在背后说别人坏话不是大丈夫所为。

There still aren't any highways in this mountain region. All goods are transported on the backs of people and horses.

那多山地区还没有高速路。所有货运被驮在人的背上或在马的背上