Plants2--The Water Hyacinth

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英文原文：

The Water Hyacinth

The water hyacinth grows in tropical countries. It has beautiful purple-blue flowers, but everybody hates it. Why?

Millions and millions of these plants grow in rivers and lakes.Sometimes / the plants become so thick / that people can walk on them. People cannot travel in boats /on the water, and they cannot fish in it. The plants stop the water from moving.Then the water carries diseases. Farmers cannot use the water on their land.

Now / scientists think that water hyacinths can be useful. The plants are really a free crop. Noone has to take care of them. They just grow and grow and grow.What can farmers use them for?

Some fish like to eat them. Farmers can grow these fish in the lakes and rivers.

Workers can collect and cut the plants with machines. Then they can make fertilizer to make their crops grow better. They can also make feed / fortheir farm animals.

Maybe it will be possible to make methane gas (CH4) for energy.(We burn gas from petroleum for energy.Methanegas can be made from plants.) Then / poor tropical countries will not have to buy so much expensive petroleum. Maybe in the future / people will love the water hyacinth instead of hatingit.