up to par:as good as usual or as good as it should be 达到通常(或应有)的水准

I didn't think her performance was up to par. 我认为她的表演没有达到一定的水平.



below/under par: less well, good, etc. than is usual or expected 不太好;不佳;不及平常好;不如预期

I may take tomorrow off if I'm still feeling under par. 如果我还不舒服,我明天可能休息一天.
Teaching in some subjects has been well below par. 一些科目的教学一直远达不到标准.



on a par with somebody/something: as good, bad, important, etc. as somebody/something else 与…同样好(或坏、重要等);不相上下;不相伯仲

He doesn't think his salary is on a par with his position in the company.
他觉得自己的薪水与在公司里的职位不相符.

As actors, I would say they were on a par.
作为演员来讲,我觉得他们不相上下.