在这里，“上”是表示达到某种程度或者是数量。

Here it means "reaching certain degree" or "certain amount".

youdao

为了达到某种程度的压制，自然要求某个最小时间。

For a certain degree of attenuation nature demands a certain minimum time.

youdao

你可能认为它应该达到某种程度，但你不得不现实一点。

You can analyse it to the nth degree but you have to be realistic about this.

youdao

And what the Republic tries to do is to offer us strategies, maybe we might even call it a therapy, Thumos for dealing with thumos, for submitting it to the control of reason and helping us to achieve some level of balance, of self-control and moderation.

而《理想国》尝试做的是,提供我们策略，而我们甚至能称之为疗法，用以处理，让它接受理性的控制,并助我们达到某种程度的平衡，介于自控与节制之间。

耶鲁公开课 - 政治哲学导论课程节选