tán / pàn / zhōng / shuāng / fāng / yī / lái / yī / wǎng / zuì / hòu / zhōng / yú / dá / chéng / le / xié / yì

谈判中双方一来一往，最后终于达成了协议。

During the negotiations, both sides exchanged proposals back and forth and finally reached an agreement.