After a pint of blood is collected, it is processed into its transfusible components: plasma, platelets and red blood cells.
采集一品脱血液后，将其加工成可输血的成分：血浆、血小板和红细胞。
Blood cells like red blood cells float in the plasma.
血细胞就是像在血浆里漂浮的红色血细胞。
The researchers used plasma because blood cells are actually too large to travel through the blood-brain barrier into the brain.
而之所以研究人员在实验中使用血浆，是因为血细胞较大，无法通过血脑壁障进入大脑。
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