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人体就像个大池塘,体液是池塘中的水,细胞是池塘中的鱼,水受污染,鱼就会生病甚至死亡,水是鱼健康生存的第一条件。同样道理,体
The human body is like a large pond. Body fluid is the water in the pond. The cells are the fish in the pond. The water is polluted. The fish will get sick or even die. Water is the first condition for healthy fish to survive. The same reason, body