We need to improve on our performance against Nabisco.

我们需根据纳贝斯克公司标准来提高我们的业绩。

He hopes to improve on his tally of three goals in the past nine games.

他希望提高在过去九场比赛中打进三球的纪录。

This apparition grew to an old age, until he reached a maturity he could not improve on, and now he haunts the church in which his parents had married.

这个幽灵已到老年，直到他成熟到无法再前进的地步，现在他常出没在他父母结婚的教堂里。

Amazon will continue to improve on the Kindle.

亚马逊将继续改进kindle。

We can only improve on the situation, right?

我们只能改善现有情况，对不？