在古代非洲，人们用贝壳作为货币进行交易。

In ancient Africa, people used ___cowries as money for trade.

她在海滩上收集了一些漂亮的贝壳，其中就有几个宝贝螺。

She collected some beautiful shells on the beach, including a few ___cowries.

她的手链由白色的小海螺编织而成。

Her bracelet was woven with small white ___cowries.