Summer presents a mixed bag to people. It can make people drip with sweat, which promotes metabolism in internal body to a certain extent. Without a doubt, that is beneficial to human health. Children can swim and play in the water. The joy of dancing with water can be fully undergone. Nevertheless, the other side of the coin is a nuisance to us.
Heavy rainfall can cause serious economic loss. Mountain torrents and mud-rock flow wreak havoc. Recently, the heavy rainstorm hit Beijing on 21th, July. The rainstorm is soul-stirring and heart-striking. The storm directly caused economic loss of hundreds of millions of RMB and heavy casualties of 37 people. People bore certain accountability to the seemingly 'natural disaster', which requires us to ponder.The artificial sand making machine can not only solve the problem of sand shortage but also save the cost of long distance transportation.
A man without foresight will have sorrow around the corner. In recent decades, with the increasing expansion of economic stimulus, people begin to violate natural resources crazily. Due to illegal mining and deforestation, the ecological balance is broken. Therefore, the relationship between human and nature is at stake. It is as though human is pulling a rubber band. The harder you pull, the more strained the relation will be. When the rubber is broken, it is the two sides that will hurt. So while the rubber is still elastic, opportunities should be seized to repair the environment as soon as possible and ceaseless extortion should be stopped.
Since human develops forward, economic development is the most important. The most common and important are construction of all sorts of facilities. The sand is accumulated after hundreds of years of collision, splitting, scouring and precipitation. If nothing else, sand is an indispensable material, which mainly comes from rivers, in construction. Although the rivers in China are numerous, over-excavation is not a long-term solution. With the trend of environment protection, sand maker appears at the historic moment.