2015年2月14日雅思小作文范文：The diagram shows how a simple water filter is constructed and how it functions to

2015年2月14日雅思小作文范文：The diagram shows how a simple water filter is constructed and how it functions to produce clean drinking water.

图片如下：

雅思小作文范文如下：

The provided flow diagram describes how to produce clean drinking water by water filter.

It is clear that there are several steps in this process, from the initial impure water to the final drinkable water.

At first, impure water will be pulled into an iron bucket with a wooden top. There are three filter layers in this device, namely: sand, charcoal and gravel respectively. Among the three layers, charcoal is in the middle layer, between sand and the gravel. Also, there is an iron curvilinear pipe at the bottom of the device, which links to another closed metal 。。。。。余下范文省略！

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