The middle layer is the lamina propria and it contains blood and lymph vessels.

粘膜层的中层为固有层，内含血管和淋巴管。

Those antibodies travel through the body's blood and lymph systems, hunting for the source of those antigens.

这些抗体穿过人体的血液和淋巴系统，寻找这些抗原的来源。

The body's second line of defense is in the blood and lymph. Certain white blood cells flock to infected areas and try to localize the infection by forming pus-filled abscesses.

如果脓块不破裂，将里面的脓汁引流排出，感染很可能会扩大。