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1·Every year, we invent more than 2,000 new substances, most of them contaminants, which are emitted into the environment and which are consequently present in food, air, soil and water.

每年，我们“发明”出2,000多种新物质，大多数都是污染物，它们被排放到环境中，然后出现在食物、空气、水当中。

2·Food contamination and the hazards to the human health caused by different kinds of contaminants are stated, and the measure to avoid the contaminants is also proposed in this paper.

该文阐述了各种污染源对食品的污染，以及这些因素对人体健康造成的危害，并提出解决措施。