在非洲许多地区，山药是主食之一。

In many parts of Africa, ___yam is one of the staple foods.

这种山药藤在热带地区生长得特别好。

This type of ___yam vine thrives particularly well in tropical regions.

在南方市场里，他们把这些橙色的红薯叫作山药。

At the southern market, they call these orange sweet potatoes ___yams.