In systems too large for a single group, there are layers of decision-making: the nomads of the Sahel, for example, used to have overlapping informal authorities up and down the Niger river.

在一个对于单一群体来说非常大的系统里，有着许多决策层：例如萨赫勒的游牧民族，过去有着许多互相重叠的非正式权威遍布于尼日尔河上上下下。

youdao

The results of this study can serve as reference for water management authorities in formulating river basin water rights allocation policies.

本研究成果可供水行政管理机构制定流域水权分配政策参考使用。

youdao

Authorities also said that no damage was observed at the massive Three Gorges dam, located on the Yangtze River, several hundred kilometres east of the epicentre.

官方也报道位于震中东部几百公里处长江上的三峡大坝未受到影响。

youdao

Waugh saw the blasts and said throngs of Carnival employees and others were clustered on streets leading toward the river as authorities evacuated the shipyard.

NPR: Fuel Barges Explode, Catch Fire In Ala.; 3 Hurt

Searchers recovered two bodies Thursday from the wreckage of the collapsed Mississippi River bridge, authorities said, bringing the known death toll from the Aug. 1 disaster to seven.

NPR: Officials Warn of Possible Flaw in Nation's Bridges

"We deal with the port authorities, the police, immigration authorities and Iraqi River Police, " he explained.

BBC: NEWS | UK | England | Cambridgeshire | Army patrols Iraqi fishing town