雅思写作流程图的三个实例。生产过程、自然过程图、显示流程的映射

 For glass wool, the raw materials are sand, limestone and soda ash, as well as recycled off-cuts from the production process. The raw materials are melted in a furnace at very high temperatures, typically between 1,300°C to 1,500°C. The smoke created during this process is filtered and flue gases are cleaned to minimise any environmental impact. The droplets of melt exiting the furnace are spun into fibres. Small quantities of binding agents are added to the fibres. The mineral wool is then hardened in a curing oven at around 200°C. The mineral wool is cut to the required size and shape

你能找出上述被动动词？你可以通过增加一些测序的话提高段（首先，然后等）？


范文：
The diagrams illustrate the processes of how to produce and recyle glass containers. It is clear from the diagrams that there are three stages in the process of making glass containers. Meanwhile, four steps are required to recycle glass.
At the first stage of producing glass containers, sand is mixed with soda ash, limestone and other chemicals. This mixture is then brought and is melt in glass furnace where it is heated in high temperature which is approximately 1500˚C . The process continues with shaping the molten glass blowing, and then glass containers are produced at the final stage.
The first step of recycling glass is collecting the used glass. This collection is then sorted by colour before washing to remove impurities. The next steps of the cycling process, the sorted materials are crushed and melted. At the final step, these materials come to the moulding stage where they become final new products.
（159words, band 9)

除了“生产过程”之外，还有两种类型的流程图：

雅思小作文生命周期流程图的文章

The diagram illustrates the various stages in the life of a honey bee. We can see that the complete life cycle lasts between 34 and 36 days. It is also noticeable that there are five main stages in the development of the honey bee, from egg to mature adult insect.

The life cycle of the honey bee begins when the female adult lays an egg; the female typically lays one or two eggs every 3 days. Between 9 and 10 days later, each egg hatches and the immature insect, or nymph, appears.

During the third stage of the life cycle, the nymph grows in size and sheds its skin three times.

显示流程的映射

This moulting first takes place 5 days after the egg hatches, then 7 days later, and again another 9 days later. After a total of 30 to 31 days from the start of the cycle, the young adult honey bee emerges from its final moulting stage, and in the space of only 4 days it reaches full maturity.

(169 words, band 9)

It is clear that the village grew as the transport infrastructure was improved. Four periods of development are shown on the map, and each of the populated areas is near to the main roads, the railway or the motorway.

From 1868 to 1883, Chorleywood covered a small area next to one of the main roads. Chorleywood Park and Golf Course is now located next to this original village area. The village grew along the main road to the south between 1883 and 1922, and in 1909 a railway line was built crossing this area from west to east. Chorleywood station is in this part of the village.

The expansion of Chorleywood continued to the east and west alongside the railway line until 1970. At that time, a motorway was built to the east of the village, and from 1970 to 1994, further development of the village took place around motorway intersections with the railway and one of the main roads.