The main theory is that multicellular organisms started out as cells grouped together in colonies.

主要理论是，多细胞生物最初是细胞聚集成菌落。

That allows phagocytes to identify the antigen on the invaders they just ingested and transmit this information to the second major cell group orchestrating the defense, the lymphocytes.

这使得吞噬细胞能够识别它们刚刚摄入的入侵者身上的抗原，并将该信息传递给协调防御的第二个主要细胞群，即淋巴细胞。

It's thought that a combination of genetic factors and environmental factors like these contribute to which type of T cell group is most common and thereby influences the overall immune response.

如上所述，研究认为遗传和环境因素通过影响作出反应的T细胞的类型，进而影响全身的免疫反应。