Iron is essential for the formation of haemoglobin, the red pigment in blood.

铁是必不可少的组成血红蛋白，红色颜料在血液。

youdao

Blood viscosity will speed up the brain of oxygen, pigment deposition, so come early aging.

血液黏稠会加快大脑的缺氧、色素的沉积，使衰老提前来临。

youdao

Retinal pigment epithelial (RPE) cells lie between the sensory retina and the choroids, constitute the outer blood retinal barrier and play a vital role in the retinal metabolism.

视网膜色素上皮(RPE)细胞位于视网膜感觉层和脉络膜之间，构成视网膜外屏障，在视网膜的代谢中起到重要的作用。

youdao