英语翻译
Zinc is one of about 20 elements necessary for good health.It is present in the body in very small amount,but it makes it possible for important chemical actions to be carried out in cells.Scientists are just beginning to discover how zinc and other elements work.
Researchers first studied zinc as a way to speed recovery.Dr.Waltor Powys,formerly with the United States Air Force,noted that the laboratory animals recovered faster when some substances were added to their food.One of these substances was zinc.Dr.Powys later tested the zinc treatment on an American airman recovering from medical operations.The airman who received zinc sulphate recovered ion half of the usual time.Other doctors studied persons who had a number of strange disorders.The doctors learned that all of these problems were caused by a lack of zinc in the body.They treated these disorders successfully by giving the patients zinc sulphate.
The amount of zinc in the body can be found by examine the blood and hair.A lack of this important element is not uncommon among people ion both industrial and developing countries.Zinc is found in most high protein foods,such as meat,milk,fish and eggs.It is also found in whole grains.But many people do not eat enough of these foods.Food makers should add these elements so that more people could get needed amounts of these essential substances.