In golf, par is the number of strokes that a good player should take to get the ball into a hole or into all the holes on a particular golf course.
He was five under par after the first round.
第一轮过后他低于标准杆5杆。
on a par with
If you say that two people or things are on a par with each other, you mean that they are equally good or bad, or equally important.
The water park will be on a par with some of the best public swimming facilities around.
这个水上公园将与周围那些最好的公共游泳场所一样好。
below par , under par
If you say that someone or something is below par or under par, you are disappointed in them because they are below the standard you expected.
Duffy's primitive guitar playing is well below par.
达菲的吉他演奏技巧简单,远未达到预期水平。
A teacher's job is relatively safe, even if they perform under par in the classroom.
教师的工作是相对保险的,即使他们的授课水平不尽如人意。
up to par
If you say that someone or something is not up to par, you are disappointed in them because they are below the standard you expected.
It's a constant struggle to try to keep them up to par.
要使他们达到标准是一场持久战。
below par , under par , not up to par
If you feel below par or under par or not up to par, you feel tired and unable to perform as well as you normally do.
After the birth of her baby she felt generally under par.
生过孩子以后她感到身体大体上不如平常了。