Well, you show the thing that would cause you to have the fear without the unconditioned stimulus.

找出在非条件刺激不存在的情况下,能够使你感到恐惧的东西。

耶鲁公开课 - 心理学导论课程节选

In the case of the helper cells they stimulate a specific population of B-cells to mature into antibody producing cells, and that antibody is generated against the antigen that stimulated it.

以辅助性T细胞为例,辅助性T细胞刺激特定的B细胞,使这些细胞成长为抗体分泌细胞,抗体分泌细胞产生大量的抗体,以消灭大量增殖的抗原

耶鲁公开课 - 生物医学工程探索课程节选