林峰的问题很好。血色素里面有铁，所以是红颜色。另外血液里大量的红细胞也是红色的。
Lín Fēng de wèntí hěn hǎo 。xuèsèsù lǐmiàn yǒu tiě ，suǒyǐ shì hóng yánsè 。lìngwài xuèyè lǐ dàliàng de hóngxìbāo yě shì hóngsè de 。
Lin Feng's is a good question. There is iron in hemoglobin, so it is red. Furthermore, blood contains a large quantity of red blood cells, which are also red in color.