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血管如果把人体里的血管连接起来,可达15万公里长,可以绕地球赤道3圈。人体里的大脑,血管特别多,如果把它们连接起来,长可达120多万里。由此可见,大脑对氧和养料需要的程度了。
Blood vessels connect blood vessels in the human body up to 150,000 kilometers long and can circulate 3 times around the Earth’s equator. The brains and blood vessels in the human body are particularly large. If they are connected, they can grow to more than 1.2 million miles. This shows that the brain needs oxygen and nutrients.