(1)生命的物质基础 The Physical Bases of Life >人体-水65%：By mass,human cell body consist of65% water(H2O).Oxygen therefore contributes a majority of a human body's mass. >氧、碳、氢、氮、钙、磷99%：Almost99%of the mass of the human body is made up of the six elements oxygen, carbon,hydrogen,nitrogen,calcium,and phosphorus. >钾、硫、钠、氯、镁0.85%其余为微量元素，如锌：About 0.85%is composed of only five elements:potassium,sulfur, sodium,chlorine,and magnesium.All are necessary to life. The remaining elements are trace elements,of which more than a dozen are thought to be necessary for life,or play an active role in health ew ipedia.org/wiki/Composition_of_the_human ody1 （1）生命的物质基础 The Physical Bases of Life 人体-水65%：By mass, human cell body consist of 65% water (H2O). Oxygen therefore contributes a majority of a human body‘s mass. 氧、碳、氢、氮、钙、磷 99%：Almost 99% of the mass of the human body is made up of the six elements oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. 钾、硫、钠、氯、镁 0.85%其余为微量元素，如锌：About 0.85% is composed of only five elements: potassium, sulfur, sodium, chlorine, and magnesium. All are necessary to life. The remaining elements are trace elements, of which more than a dozen are thought to be necessary for life, or play an active role in health (http://en.wikipedia.org/wiki/Composition_of_the_human_body)