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。

The goods are not up to par.

价钱都在货物上标明了。

Your last shipment wasn't up to par.

你上次送的货没有达到标准。

Your work is not up to par this week.

你这星期的工作没有达到标准。

A: Yes, your last shipment wasn't up to par.

A：嗯，你上次送去的货没有达到标准。