雅思写作范文之砖块的制作

　　Then the lumps of clay are placed on a metal grid in order to break up the big chunks of clay into much smaller areas, which fall through the metal grid onto a roller, whose motion further segregates the bits of clay. Sand and water are added to make a homogenous mixture, which is then either formed in moulds or cut into brick-shaped pieces by means of a wire cutter.

　　Those fresh bricks are then kept in a drying oven for at least 24 and a maximum of 48 hours, several dozens if not hundreds of bricks at a time. The dried bricks are then transferred to a so-called kiln, another type of high temperature oven. First they are kept at a moderate temperature of 200℃-1300℃. This process is followed by cooling down the finished bricks for 48 to 72 hours in a cooling chamber.

　　Once the bricks have cooled down and have become hard, they get packaged and delivered to their final destination, be it a building site or storage.