背靠背在英语中可以翻译为 back-to-back，它的来源可能源于人们在向后面看时身体的姿势。下面是一些英文例句和它们的中文翻译：

They sat back-to-back on the bench, ignoring each other. 他们背靠背坐在长椅上，相互忽视。

The houses were built back-to-back, with no space between them. 这些房子背靠背建造，中间没有空隙。

The team won back-to-back championships. 这支队连胜两届冠军。