听力文摘 | 人体如何造血

【新朋友】点击标题下面蓝字【可可英语】加关注【老朋友】点击手机右上角图标【转发分享】内容If blood didn't circulate through our bodies, carrying oxygenand nutrients, we wouldn't be able to live.如果血液不能在我们身体内循环，为人体输送氧气和营养，我们便无法存活。Blood is soimportant to life that the body constantly makes new blood.血液对生命十分重要，所以人体会不断的制造新鲜血液。To do this, the body must produce the liquid part of blood, called plasma, and the cells that floatin it.人体在造血时必须要产生血液的液体部分，即血浆，以及浮在血浆上的细胞。Plasma is made mostly of water and salts that we absorb through our digestive tracts everyday.血浆主要由我们通过消化道每天吸收的水和盐组成。Its job is to delive ………………………………