B and T cells make up the adaptive immune system, while NK cells are part of the innate immune system.

B细胞和T细胞组成了适应性免疫系统，而NK细胞是固有免疫系统的一部分。

In this case there is no need to build in a level of protection against the innate immune system, since it will not notice anything wrong.

在这种情况下， 没有必要建立针对先天免疫系统的保护层，因为它不会注意到任何错误。

The dendritic cell, which is part of the innate immune system, bridges the innate and adaptive immune responses when it presents the antigen to the T cell - part of the adaptive immune system.

树突状细胞，作为固有免疫系统的一部分；在呈递抗原给T细胞时，将固有和适应性免疫反应连接了起来（是适应性免疫的一部分）。