Now, B-cell development begins in the bone marrow, which is a primary lymphoid organ.

B细胞产生于骨髓，一种初级淋巴器官。

Humans have hundreds of lymph nodes, scattered throughout the body, and they're considered secondary lymphoid organs.

人有很多淋巴结，分散在身体的各个部位；他们（淋巴结）被认为是次级淋巴器官。

Another type of lymphoid organ are lymph nodes, which are tightly packed balls of lymphoid cells and protein.

另一种淋巴器官的类型是淋巴结，它们是紧密包裹的淋巴细胞和蛋白质。

A final set of lymphoid organs worth mentioning are the tonsils, which include the adenoid, tubal tonsils, palatine tonsils, and lingual tonsils.

最后值得一提的淋巴器官是扁桃体，包括腺样体（咽扁桃体）、咽鼓管扁桃体、腭扁桃体和舌扁桃体。

Another lymphoid organ is the thymus, which is in the upper part of the chest - just below where a necklace might sit.

另一个免疫器官是胸腺，它位于胸的上部，刚好低于佩戴项链的位置。

Lymphoid organs remove foreign material from the lymph to keep it from entering the bloodstream, and act as lookout points for the body's immune defenses.

淋巴器官从淋巴中移除异体物质，阻止它们进入血流，也发挥免疫防御岗哨的作用。

Another lymphoid organ is the spleen, which is about the size of a fist, and sits on the left side of the body below the diaphragm and on top of the stomach.

另一个淋巴器官是脾，大约拳头大小，位于身体左侧，膈肌下方、胃的上方。

Some lymphoid organs are in the form of diffuse lymphoid tissue, where they are just a loose arrangement of lymphoid cells and protein, this is typical in the lining of the gastrointestinal and respiratory tract.

一些淋巴器官以弥散淋巴组织的形式存在，它们只是由淋巴细胞和蛋白质松散排列而成，这在胃肠道和呼吸道的内层很典型。