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Neutrophils, which are formed in red bone marrow, are the most common type of WBC.Through phagocytosis, neutrophils play a major role in the immune system’s defense against pathogens including bacteria, viruses, and fungi. Phagocytosis is the process of destroying pathogens by surrounding and swallowing them.
Basophils, which are formed in red bone marrow, are the least common type of WBC.Basophils are responsible for the symptoms of allergies.
Eosinophils are formed in red bone marrow and then migrate to tissues throughout the body. Eosinophils destroy parasitic organisms and play a major role in allergic reactions.
Lymphocytes are formed in red bone marrow, lymph nodes, and the spleen. Lymphocytes identify foreign substances and germs (bacteria or viruses) in the body and produce antibodies that specifically target them.
Monocytes are formed in red bone marrow, lymph nodes, and the spleen. Through phagocytosis, monocytes provide immunological defenses against many infectious organisms.
词汇：
neutrophils 中性粒细胞 neutr/o 中性的 -phil 吸引（嗜）
phagocytosis 吞噬作用 phag/o吃，吞咽 cyt/o细胞 -osis通常表示一种状态
basophils 嗜碱性粒细胞 bas/o碱 -phil 吸引（嗜）
eosinophils 嗜酸性粒细胞 eosin/o红，玫瑰红 -phil 吸引（嗜）
lymphocytes 淋巴细胞 lymph/o 淋巴 -cytes 细胞
monocytes 单核细胞 mon/o 一个，单个 -cytes 细胞
red bone marrow 红骨髓
pathogens 病原体（复数） pathogen(单数)
bacteria 细菌（复数） bacterium(单数)
viruses 病毒（复数） virus(单数)
fungi 真菌（复数） fungus(单数)
parasitic organisms 寄生生物
allergies 过敏（复数） allergy(单数)
germs 微生物（复数）germ(单数)
参考译文：
在红色骨髓中产生的中性粒细胞是最常见的白细胞。中性粒细胞通过吞噬作用，在免疫系统防御细菌、病毒和真菌等病原体方面起着重要作用。吞噬作用是通过包围和吞噬病原体来摧毁病原体的过程。
在红色骨髓中产生的嗜碱性粒细胞是最不常见的一类白细胞，它是引起过敏症状的原因。
嗜酸性细胞在红色的骨髓中产生，然后迁移到全身各个组织中。嗜酸细胞破坏寄生生物，在过敏反应中起主要作用。
淋巴细胞在红骨髓、淋巴结和脾脏中产生。淋巴细胞识别体内的外来物质和微生物（细菌或病毒），并产生针对它们的抗体。
单核细胞在红骨髓、淋巴结和脾脏中产生。单核细胞通过吞噬作用形成免疫防御抵抗许多引起感染的微生物。
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