往还[wǎng huán]
词典dealings：来往；买卖，交易。
词典contact：接触；触点；[医]（传染病）接触人；门路。
词典keep in contact：保持联络；往还。
词典\u0064\u0061\u006E\u0063\u0069\u002E\u0039\u0031\u0031\u0063\u0068\u0061\u002E\u0063\u006F\u006D
词典have social dealings with：往还。
往还[wǎng huán]
keep in contact; have social dealings with; contact; dealings; intercourse:
例：经常有书信往还
write to each other frequently; keep in contact by correspondence