雅思写作小作文范文 雨水当饮用水用

雅思写作小作文范文

雨水当饮用水用

雅思作文其实离 不开考生平时的积累和练习，那么有哪些好的作

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一起来看看雅思写作小作文范文：雨水成为饮用水，

The flow chart above shows the process of purification of

rain for drinking water in Australian. Overall, 4 main

stages are involved: collection, filtration, storage and

treatment.

Firstly, rain falling on the roof, the raw material for

drinking water, flows down along gutters and into drains,

which then direct the water into underground filtration

system. Next, water goes through a physical filter slowly

which serves to remove particulates from rainwater. After

percolation, the water is delivered by the pipe to a large

cube-shaped container and be stored carefully.

For the purpose of producing drinkable water, there is

another stage for further treatment. Specifically, the

water is transferred into a bigger tank, in which some