How to make chocolate
The diagram shows the stages in the process ofmaking chocolate.
Chocolatecomesfrom the cacao tree, which is grown in parts of SouthAmerica, Africa and Indonesia.
【开头不能冲上来就直接介绍cacaotree，而是通过主题词chocolate引出，否则显得太唐突】The tree produces large red pods which contain whitecocoa beans. Firstly, when the pods are ripe,they areharvested, the beans are removed and they are fermented for several days inlarge wooden boxes.
During the fermenting process, the beans turn brown.
Next,the brown beans are spread in the sun to dry. They arethen put in large sacks and transported by train or lorry. After this, the beans are taken toa chocolate factory where they are roasted in an oven at temperatures ofbetween 250 and 350 degree Celsius.
After beingroasted, the beans are crushed and the outer shell is removed. This part is notneeded for making chocolate. Finally, the inner part of the bean is pressedand liquid chocolate is produced.
*Clay: type of sticky earth that is used for makingbricks, pots, etc.
The process by whichbricks are manufactured for the building industry can be outlined in sevenconsecutive steps. First the raw material, clay, which was just below thesurface of soil in certain clay-rich areas has to be dug up by a digger.
Then the lumps of clayare placed on a metal grid in order to break up the big chunks of clay intomuch smaller areas, which fall through the metal grid onto a roller, whosemotion further segregates the bits of clay. Sand and water are added to make ahomogenous mixture, which is then either formed in moulds or cut intobrick-shaped pieces by means of a wire cutter.
Those fresh bricks arethen kept in a drying oven for at least 24 and a maximum of 48 hours, severaldozens if not hundreds of bricks at a time. The dried bricks are thentransferred to a so-called kiln, another type of high temperature oven. Firstthey are kept at a moderate temperature of 200 ℃-1300℃. This process is followed by cooling downthe finished bricks for 48 to 72 hours in a cooling chamber.
Once thebricks have cooled down and have become hard, they get packaged and deliveredto their final destination, be it a building site or storage.