血细胞

　　Blood cells, which can be seen under a microscope, make up about 40% of the blood's volume. Blood cells are made in the bone marrow by blood 'stem' cells. Blood cells are divided into three main types.

　　血细胞（血球）。从显微镜中观察，血细胞占躯体容量的40%左右，由骨髓中的血“干”细胞生成。血细胞可分成三大类：

　　Red cells (erythrocytes). These make blood a red colour. One drop of blood contains about five million red cells. Red cells contain a chemical called haemoglobin. This binds to oxygen, and takes oxygen from the lungs to all parts of the body. form www.med66.com

　　红细胞（红血球）。红细胞使血变红。一滴血约含500万红细胞。红细胞含有一种化学物质，叫血红蛋白，它与氧气结合，将氧气从肺部输送到全身各部分。

　　White cells (leucocytes). There are different types of white cells such as neutrophils, lymphocytes, eosinophils, monocytes, basophils. They are a part of the immune system and are mainly involved in combating infection.

　　白细胞（白血球）。白细胞分多种，如嗜中性粒细胞、淋巴细胞、嗜酸性细胞、单核细胞和嗜碱粒细胞等。为免疫系统一部分，其主要作用是抗感染。 医学教育网

　　Platelets. Platelet is a minute, irregularly shaped, disklike cytoplasmic body found in blood plasma that promotes blood clotting and has no definite nucleus, no DNA, and no hemoglobin. It is also called thrombocyte.

　　血小板：血小板为血浆中一小形、不规则形、盘状细胞质，可促进血液凝固，无细胞核，无DNA，也不含血红素。又称凝血细胞。