The rice varieties with strong root system, large active absorption root surface and total root surface area had strong tolerance to copper poison.
根系发达、根系活跃吸收表面积及总吸收表面积大的品种，有较强的耐铜毒性。
The five million villi in the small intestine provide a total area for food absorption of more than five times the surface area of the body.
小肠内五百万肠绒毛形成的食物吸收区，其面积比人体表面大五倍。
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