Task：The process of collecting rain water and purifying it to drinking water in Australia.
思路解析：
1. 需要看懂图形之间的顺序，并找到流程的起点和终点。
2. 所有图片及其图片信息都需要被描述，尽量不要忽略图形。
3. 在文字上，由于是进行客观描述，需要采用大量的被动句式和定语从句。
4. 为了突出顺序性，需要采用大量的连接词进行辅助说明，如At first, Secondly, then, next, after that, finally等。
5.大量使用被动句，这能体现客观性。
6.积极地进行词汇的同义替换。
7.灵活地使用定语从句来进行细节补充，如in which。
参考范文：
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 chemicals are added and mixed with stored water. This chemical reaction is able to fully eliminate impurities, thus enhancing the quality of water up to a safe and potable level for human.
Finally, through water pipe, the well-treated water is pressed and directed to the resident house for daily use.
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