三股的

A threefold cord is not quickly broken.

三股绳子不易断。

Three forces are combining with deadly effect on the Indian Ocean island, which is incalculably rich in wildlife but impoverished in basic infrastructure.

马达加斯加，这个野生动物资源无比丰富但基础建设薄弱印度洋岛屿国家，受到三股力量致命影响。