If a helper cell recognises an antigen, it becomes activated.

如果某一个助细胞识别出一个抗原，该助细胞就会被活化。

Profound immunologic changes occur during pregnancy, involving a polarization of t helper cells towards a dominance of Th2 and regulatory t cell effector responses in both mother and fetus.

意义深远的免疫性的改变发生在怀孕期间，对于在母亲和胎儿中多数的th2和调整的t细胞效应器都反映包括了th细胞的极化。

Sat-RNA of CMV is a subviral agent, which depends on its helper virus to replicate and cell to cell diffuse.

CMV 的 Sat-RNA 是一种亚病毒剂，取决于其辅助病毒的复制和细胞间的扩散。

Both "helper" (CD4) and "cytotoxic" (CD8) T-cell classes have been described.

现已明确两类T细胞：辅助性T细胞(CD4)和细胞毒性T细胞(CD8)。