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Or else healthy people can drop up to 20% of their blood quantity (about two times the quantity that anyone donates at a blood generate) without turning out to be symptomatic with weak spot, lightheadedness, lower hypertension or shortness of breath.我来推荐两个网站，一个几乎涵盖了所有中文书籍电子版，一个几乎涵盖了