scratch back

Scratch my back—I've got an itch.

帮我挠挠背——有点痒。

He wanted me to scratch his back, he itched.

他想让我给它搔背, 他很痒.

Now rub your nut across the whole length of the scratch, back and forth several times.

现在，沿着整条刮痕涂抹，来回反复进行几次。

And now like maniacs, They scratch your back, even when it doesn't itch.

现在他们好像疯子，即使你背不痒，他们仍不断抓挠。

The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".

第二种形式是互惠的利他主义，或者说“你帮我搓背我也帮你搓背”。

Would you scratch my back for me? I've got a dreadful itch and I can't reach it.

你能帮我挠背吗？我背上很痒却又够不到。

The contract went to a friend of the chief accountant: it's you scratch my back and I'll scratch yours.

承包合同批给了总会计师的朋友，各有好处、串通一气。

If you give me a hand clearing the rubbish from my garden I will help you to paint your house& you scratch my back and I will scratch yours.

如果你帮助我把这些垃圾从我的花园清除出去，我会帮你粉刷房子&投桃报李嘛！

Kevin Arnovitz, ESPN.com: A. Contrary to popular opinion, a series doesactually start before a team wins on the road, but two games in Cleveland where the Cavs have won eight straight gives them plenty of opportunity to scratch back.

我选A，与主流的观点相反，我觉得一轮系列赛真正始于一支球队能在客场赢下比赛，但是接下来的两场比赛，骑士可以有足够的机会重新振作起来，因为他们已经在季后赛豪取主场八连胜了。

It began with a few dozen readers and now has over 50,000 ( being completely rebuilt from scratch a few years back, after I changed employers).

起初只有几十位读者，如今读者数已经超过50000人（几年前我换了雇主之后完全从头做起的）。

Mary said," you scratch my back and I'll scratch yours."

玛丽说：“如果你帮我，我就帮你。”

Hey, dude, can you scratch my back?

嘿，哥们，帮我挠挠背好吗？

Role of Scratch on the Back Slit of Chamber in Identifying Shooting Gun

弹膛后切口刮擦痕迹在认定发射枪支中的作用

reciprocity, "you scratch my back, I'll scratch yours;"

互惠心态：“你帮我挠背，我帮你挠背，”