据统计,全世界每年死于癌症者达两百万人。在美国,每年死于癌症者仅次于冠心病,居其全国各种病的死亡率的第二位。一般认为绝大多数癌症是由于环境因素引起,其中以饮食为主要的因素;工业有害物质的接触致癌者只是少数。因此“癌从口入”也成为许多人所关心的问题。 According to statistics, there are two million people who die of cancer each year in the world. In the United States, the number of people who die of cancer each year is second only to coronary heart disease, ranking second among all kinds of disease deaths in the country. It is generally believed that the vast majority of cancers are caused by environmental factors, of which diet is the major factor. There are only a few carcinogenic contacts with industrial hazardous substances. Therefore, “cancer from the mouth” has also become a concern of many people.