淤塞河道、水库和渠系；

Silting up river course, reservoir and channel.

出水管阻力太大，旋转方向不对，叶轮淤塞。

Resistance in the outlet pipe is too large. The rotation direction is wrong. The impeller is stagnated.

在水库被淤塞之前，三门峡一直是这个民族的骄傲。

Sanmenxia was the nation's pride until its reservoir silted up.

而进口的水葫芦正在淤塞长江和珠江的部分河段。

And imported water hyacinth plants are choking some parts of the Yangtze River and the Pearl River.

墨累-达令的河口开始被泥沙淤塞，这是过度开发的有力信号。

The mouth of the river was beginning to silt up-a powerful symbol of over-exploitation.