Once this was done and the silt carried down by the rivers was planted, the rewards were rich: four to five times what rain-fed earth would produce.

一旦完成了这个，河流带来的淤泥会沉积在此处，回报是丰厚的：产量是被雨水滋养的土壤的四到五倍。

youdao

Four of the top 10 longest rivers flow through China at some point.

十条最长的河流中有四条都流经中国。

youdao

It is the Four Rivers Chapter of a motor bike club, who have come to offer their help to the relief effort.

BBC: Villagers despair in Hungary's red wasteland

There gullies on the four rivers that vein the reservation's 930, 000 unfenced hectares attract antelope, mule and whitetail deer, turkey, coyote and grouse.

FORBES: Magazine Article

None equals the Four Rivers.

WSJ: Rome's Piazza Navona: Perfection, Squared | Masterpiece by Willard Spiegelman