You should spend about 20 minutes on this task.
The diagrams below show the stages and equipment used in the cement-making process, and how cement is used to produce concrete for building purposes.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
You should write at least 150 words.

再将“三部曲”的答案，利用逻辑衔接词、从句过渡，并添加上修饰性成分，如介词短语，不定式，我们可以得出整个段落：

To produce cement, the raw materials, limestone and clay are crushed into powder and then mixed before being heated in a rotating equipment with a heater at the bottom. The heated mixture is ground into even smaller particles ready to be bagged.

第二个流程图，材料虽然复杂，但是流程相对单一。依照流程图“三部曲”的步骤，我们可以得出第二个正文段落:

In order to make concrete which is the major material for building purposes, a mixture consisting of cement, water, sand and gravel, a kind of small stones, is needed. Gravel and sand are the two major materials, representing 50% and 25% of the raw substances, while the ratios of cement and water are relatively low (15% and 10% respectively).

These materials are mixed and rotated in a concrete mixer until the concrete is produced. 

以上是老师给大家带来的雅思流程图“三部曲”，希望能够对大家有所帮助。同学们认真复习，积极备考，祝大家早日取得优异的成绩。