名解
*Essential nutrients: The essential substances are vital for growth and maintenance of a healthy body throughout life.Two characteristics: 1/ its omission from diet must lead to a decline in certain aspects of human health; 2/ if the omitted nutrient is restored to the diet before permanent damage occurs, those aspects of human health hampered by its absence should regain normal function.
*Acid rain: Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses low pH (<5.6). Acid rain is caused by emissions of SO2 and NOx.
*Soil:Soil is the unconsolidated or loose covering of fine rock particles that covers the surface of the earth. It is the complex of minerals, organic materials, water, air, etc.
*Raynaud’s disease: a vasospastic(血管痉挛的) disorder causing discoloration of the fingers, toes, and occasionally other areas.
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