We also have an idiom: " If you scratch my back, I'll scratch yours."

“如果你帮我，我就会帮你。”

I'm thinking, you scratch my back, I scratch yours.

我的想法是，你帮我挠背，我也帮你挠背。

The other route to co-operation is reciprocal altruism of the you scratch my back and I'll scratch yours variety.

另一种合作方式是互惠利他主义，即“你帮我，我帮你”。

You scratch my back and I'll scratch yours.

你挠我的背，我也挠你的。

I mean, you scratch my back, I scratch yours.

你帮帮我 我帮帮你。

Get the best men for the job instead of old chums, party hacks, and you scratch my back and I'll scratch yours.

任命贤才，而不让那些小集团和党棍送来送去。

But at a very basic level - it appears mongoose society also follows the rule, You scratch my back, and I'll scratch yours.

但从非常基础的层面来说，似乎侏獴社会也遵循“投桃报李”这一规则。

Literally, you scratch my back and I'll scratch yours, and I might pick a few lice off while I'm at it.

从字面上看， 你挠我的背， 我也挠你的，我可能会在抓挠的时候摘下几只虱子。

This is an old expression: " You scratch my back and I'll scratch yours." Your " back" here means the back of your body, between your head and your waist.

” 这里的“背” 是指身体的后背， 在头和腰之间。