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关注:1
2013-05-23 12:21
求翻译:These scientists have already discovered a lot about our world. For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy- five times a minute. Your heart is a pump that pumps blood to all parts of the body. The blood carries oxyg是什么意思? 待解决
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- 离问题结束还有
These scientists have already discovered a lot about our world. For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy- five times a minute. Your heart is a pump that pumps blood to all parts of the body. The blood carries oxyg
问题补充: |
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