It's simply your psychological immune system will become stronger, hopefully already by the end of this semester.

只是你的心理免疫系统会变得更强，希望在本学期未就见成效。

哈佛公开课 - 幸福课课程节选

The immune system is stronger, so it also helps in terms of physical health.

免疫系统更强，所以对身体健康也有帮助。

哈佛公开课 - 幸福课课程节选

Psychological immune system will become stronger.

心理免疫系统会变得更强。

哈佛公开课 - 幸福课课程节选

The two analogies we use " was strengthening our immune system or stronger "psychological engine" that has the capacity to endure more not just from the negative to zero, but also from the zero to the positive.

我们使用的两个类比,是加强我们的免役系统或加强“心理引擎“,获得更强大的忍受能力,不只是从负到零，还要从零到正。

哈佛公开课 - 幸福课课程节选