His name is Ouseman, and he's a master mason in Djenne, an ancient city made entirely of river mud.

他叫乌瑟曼，是杰内古城的泥瓦匠专家，这座古城所有建筑均由河泥建成。

There's been a mud mosque in Djenne for 700 years, the sacred heart of a city fashioned from river mud.

杰内古城的清真寺已有七百年的历史，这个神圣的一城中心因河泥而兴旺着。

Using clay bricks made from river mud, they began to build multi-storied homes and temples.

他们用河泥制成的粘土砖开始建造多层房屋和寺庙。