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淋巴系統(tǒng)是人體內(nèi)重要的防御功能系統(tǒng)，它遍布全身各處，由淋巴管（分為毛細(xì)淋巴管、淋巴管、淋巴干與淋巴導(dǎo)管），淋巴組織（分為彌散淋巴組織與淋巴小結(jié)），淋巴器官（如胸腺、骨髓、脾、扁桃體等）構(gòu)成。
淋巴系統(tǒng)一方面引流淋巴液，清除機(jī)體內(nèi)的異物、細(xì)菌等，另一方面淋巴系統(tǒng)是身體防御的前哨，分散于身體各部分淋巴結(jié)似一濾過(guò)裝置，可有效阻止經(jīng)淋巴管進(jìn)入的微生物。

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the lymphatic system is a multi functional body system
淋巴系統(tǒng)是一個(gè)多功能的身體系統(tǒng)
its roles include transportation of lymph and combating infection
它的作用包括運(yùn)輸淋巴液和對(duì)抗感染
the components of the lymphatic system include lymphatic vessels
淋巴系統(tǒng)的組成部分包括淋巴管
lymph nodes
淋巴結(jié)
and lymphatic organs
和淋巴器官
lymphatic vessels form an extensive network of thin walled vessels that transport lymph around the body
淋巴管形成廣泛的薄壁血管網(wǎng)絡(luò),將淋巴液輸送到全身
eventually emptying it into the Venus system
最終將其排空到金星系統(tǒng)中
lymphatic vessels contain numerous Valves and have a beaded appearance bulging between adjacent valves when filled with lymph
淋巴管包含許多瓣膜,當(dāng)充滿淋巴液時(shí),相鄰瓣膜之間呈珠狀凸出
lymph nodes are small masses of lymphatic tissues
淋巴結(jié)是小塊淋巴組織
situated along the course of the superficial and deep lymphatic vessels
位于淺層和深層淋巴管的走行方向
their function is to filter lymph as it passes through the lymphatic system and rout to the Venus system
它們的功能是在淋巴液通過(guò)淋巴系統(tǒng)并流向金星系統(tǒng)時(shí)過(guò)濾淋巴液
lymphatic organs are structures that produce lymphocytes
淋巴器官是產(chǎn)生淋巴細(xì)胞的結(jié)構(gòu)
and include the spleen and the thymus gland
包括脾臟和胸腺
lymphocytes are white blood cells which circulate in the bloodstream and lymphatic system and are concentrated in lymph nodes
淋巴細(xì)胞是在血液和淋巴系統(tǒng)中循環(huán)的白細(xì)胞,集中在淋巴結(jié)中
they are components of the immune system and have a role in combating infection
它們是免疫系統(tǒng)的組成部分,在對(duì)抗感染方面發(fā)揮作用