2. 外语
  3. When you cut yourself, you bleed; you may even bleed to death if nothing is done to stop your bleeding, for your body cannot liv

When you cut yourself, you bleed; you may even bleed to death if nothing is done to stop your bleeding, for your body cannot liv

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问题    When you cut yourself, you bleed; you may even bleed to death if nothing is done to stop your bleeding, for your body cannot live without blood. The blood is carried in your arteries (动脉) and veins (静脉). Until doctors knew how blood moves round in the
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答案当你割破皮肉时，便会流血，如果不设法止血，甚至会因流血过多而死，因为没有血液，人体就不能生存。血液由动脉和静脉输送。直到医生们了解血液在人体流动过程之后才确知人体各器官的功能。
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