这条河流南北向贯穿整个山谷。

The river flows ___north-south through the entire valley.

今年的南北篮球赛吸引了众多球迷观看。

This year's ___north-south basketball game attracted a large crowd of fans.

这个国家的南北经济差距导致了不同的发展政策。

The ___north-south economic gap in this country leads to different development policies.