你来我往

jiù zhè yàng nǐ lái wǒ wǎng liǎng rén zhú jiàn shú xī qi lai

就这样你来我往，两人逐渐熟悉起来。

In this way, you come and go, and the two gradually become acquainted with each other.

yuán gào hé bèi gào nǐ lái wǒ wǎng hù xiāng zhǐ zé

原告和被告你来我往，互相指责。

The prosecution and defense were bandying accusations back and forth.