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每毫升(ml)血液中约有500万个红血球,一个体重55公斤的人有4.4升血液,总共约有22万亿个红血球——排列起来的总长度可达17万公里,为赤道的四倍多。肺主要由肺泡组成。一个肺泡的面积约为一粒米的十分之一。人的
There are about 5 million red blood cells per milliliter (ml) of blood, 4.4 liters of blood for a person weighing 55 kg and a total of about 22 trillion red blood cells - a total length of up to 170,000 kilometers arranged equating to four More times. Pulmonary lung mainly composed. An alveolar area is about one tenth of a grain of rice. Human