Nitrate in the human body can be reduced to nitrate reductase nitrite, and nitrite accumulation in the human body to reach a certain degree, the human body can cause toxic reactions hypoxia, patients suffering from methemoglobin. If nitrite and secondary amines with strong cancer-causing substances can form nitrosamines, which lead to human cancer of the digestive system, affecting human health. Spinach for this experiment to study, research spinach in the different treatment conditions, the effects of its nitrate content.
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Edible oil safety is an important aspect of affecting human health.
食用油脂安全问题是关系到人民健康的重大问题。
Additional major factors affecting people's health and livelihoods are a lack of access to safe drinking water, shortages of drugs and medical supplies and insufficient human resources.
影响民众的健康和生计的其它主要问题有，无法获得安全饮用水、缺少药物和医用品以及人力资源不足。
Overwhelming evidence shows that human activities are affecting the global climate. Climate change has serious implications for public health.
大量证据显示，人类活动正在影响全球气候，对公共卫生造成严重影响。
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