The human brain accounts for roughly 2% of the total mass of the human body, yet it consumes over 20% of the oxygen and nutrients the human body intakes.
人类大脑重量大致占身体总重量的2%，然而却消耗超过20%的人身体所吸收的氧气和营养。
The 20 century came, the century of the quantum mechanics, physicists declared that the human body has 2 components.
20世纪，量子力学盛行，物理学家声称人体由两部分组成。
Objective: As there is a potential health impact of SO 2 pollution on human body, it is important to understand the characteristics of population exposure to SO 2 in the urban area of Guangzhou.
目的：大气中SO 2污染会对人体健康带来潜在的危害，因此有必要了解广州市区SO 2污染与人群暴露水平。
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