HSK 6 · verb · Practice
往来
to come and go; to have dealings with; contact
两家公司往来很多年了。
Liǎng jiā gōngsī wǎnglái hěn duō niánle。
The two companies have done business together for many years.
他上次帮了我，礼尚往来，我也该帮他。
Tā shàng cì bāngle wǒ， lǐshàngwǎnglái， wǒ yě gāi bāng tā。
He helped me last time; courtesy demands reciprocity, so I should help him too.