Blood is a complicated stew of plasma proteins, red blood cells, platelets, and other cellular components. These elements perform crucial functions, such as transporting oxygen, nutrients, and immunoglobulins (which defend against infection), and regulating water content, temperature, and pH level.
血液是复杂的混合液体，包含了血浆蛋白质、红细胞、血小板和其他细胞成分。这些元素实现着关键功能，比如输送氧气、营养物质和免疫球蛋白（可防卫传染病），并调节水含量、温度和pH水平。