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简介
You've seen your own blood, when you have a cut or a scrape.You can see the veins in your wrist, and you've seen the scab thatforms as a cut heals. But do you know what blood does for you?Without blood, you couldn't play, or grow, or learn. That's becausejust about every part of your body needs blood, from your musclesto your bones to your brain. How does your body use blood? Read andfind out!
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