Duffy's primitive guitar playing is well below par.达菲粗糙的吉他演奏技巧远不够水平。

A teacher's job is relatively safe, even if they perform under par in the classroom.教师的职业相对稳定, 即使他们的课上得不怎么好。

a below par effort低于预期的努力

People say they feel below par and have no energy.人们说自己感觉不舒服, 没有精力。

If the teacher feels under par, the children are likely to suffer.如果老师感觉不在状态, 孩子们就有可能遭罪。