TOEFL® essay: This diagram illustrates a new technology to dredge for cleaning...

[Jalinous]

This diagram illustrates a new technology to dredge for cleaning canals, rivers, etc. As we can clearly see, this daredging boat composed of hydrolic arms, centrifugal pump, rotating blades, a large tube and shuttle boat.

Based on the graph, the hydrolic arms lower centrifugal pump and rotating blades into the canal. After that, the rotating blades stir up the mud, and centrifugal pump sucks it through the large tube to the shuttle boat which is located behind the dredging boat. When the shuttle boat full of mud, it will be towed out of the canal for dumping.

In general, we hope to use this technology for saving canal, rivers and cities like venice without mannual interferences.

TOEFL listening lectures: A university lecture by a professor of Comparative Religion