And that's because this is essentially a catchment area.

因为这里基本上就是一个集水区。

In theory, it's just a tube and catchment system.

理论上，它只是一个管道和集水系统。

One of them is a simple catchment system powered by bubbles, as in whew.

其中一个方法就是一个简单的集水系统，由气泡驱动，就像这样——呼。

In the 1950s the country had 50,000 rivers with catchment areas of 100 square kilometres or more.

在二十世纪五十年代的时候，流域面积达到一百平方公里甚至更多的河流达到了五万条。

The rock catchment method directs the water through a containing wall and smaller rocks that help to clean it.

岩石集水法通过一个围墙和一些较小的岩石引导水流，这些小石头有助于清洁水质。

It's the largest water catchment in the country, almost one-sixth the size of Singapore.

它是该国最大的集水区，面积几乎是新加坡的六分之一。

The number of rivers with significant catchment areas has fallen from more than 50,000 in the 1950s to 23,000 now.

重要集水区的河流数量已从50年代的50,000条减至如今的23,000条。

Or even install a rainwater catchment system.

甚至安装雨水收集系统。

595. The rest of the material was deposited part way down the catchment.

其余的物质沉积在水域中。

But Dr Samanipour found that in combination they could predict quite accurately the demographic make-up of a sewage plant's catchment area.

但Samanipour博士发现，结合起来看，它们可以相当准确地预测污水厂集水区的人口构成。