nǐ / bāng / le / wǒ / yī / cì / wǒ / bāng / nǐ / yī / cì / zán / men / jiù / suàn / chě / píng / le

你帮了我一次，我帮你一次，咱们就算扯平了。

You helped me once, and I helped you once, so we can call it even.