交换媒介：买者在购买物品与劳务时给予卖者的东西。

Medium of exchange is an item that buyers give to sellers when they want to purchase goods and services.

youdao

这里没有货币；货物与劳务直接交换其他的货物与劳务。

There is no money; goods and services are directly bartered against other goods and services.

youdao

船员劳务合同是船员与雇佣方建立劳动力交换关系的基础。

As the basis of labor relationship, the crew's contract is very important to protect the crew's benefit.

youdao