So the cranes are raising their chick in an irrigation channel.

所以鹤在灌溉渠里养育它们的幼雏。

So the grooves couldn't have worked as irrigation channels.

所以这些凹槽不能用作灌溉渠道。

First, it doesn't seem that these groups could have been used as irrigation channels.

首先，这些群体似乎不能被用作灌溉渠道。

Around 5000 BCE, early Sumerians used irrigation channels, dams, and reservoirs to redirect river water and farm large areas of previously bone-dry land.

大约在公元前 5000 年，早期的苏美尔人使用灌溉渠、水坝和水库来改变河水的方向，并在以前干涸的土地上开垦大片土地。

You see, when ancient peoples built irrigation channels, they built them so that the water from a lake or stream could flow down to a low line area where crops could be grown.

你看，当古代人建造灌溉渠道时，他们建造它们是为了让湖泊或溪流的水可以流到可以种植农作物的低线地区。