Empty paddle boats await rowers at the main cave entrance at Puerto Princesa Subterranean River National Park in the Philippines.
菲律宾的公主港地下河国家公园的主洞入口处，停靠着几只空空的桨船，在等待桨手的到来。
2
In the North-East, the Dniester is the mainriver, flowing through the country from north to south.
在东北部，德涅斯特河是主要河流，它从北方流向南方贯穿全国。
3
Ramesh says India has undertaken a 10-year program to ensure no untreated industrial effluent or urban sewage is released into the country's mainriver, the Ganges.