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针对业已明确的致癌因素所采取的预防措施称为癌症的一级预防，这是降低癌症发病率和死亡率的最根本性的措施。近年来，国内外的许多学者正致力于在人类消费的食物或饮料中寻找和筛选天然的防癌抗癌物质，这些物质必须具备以下几个条件：①通过动物和人体试验证明其能使因接触
The preventive measures taken against established cancer-causing factors are called primary prevention of cancer, which is the most fundamental measure to reduce cancer morbidity and mortality. In recent years, many scholars at home and abroad are working to find and screen natural anti-cancer and anti-cancer substances in foods or beverages consumed by humans. These substances must meet the following conditions: 1 It has been proved by animals and humans that they can cause contact