完善股票发行上市制度的英文：
improve the system for IPO and listing on stock markets

improve是什么意思：
v. 改进；提高…的价值；利用；提高

There is still room for improvement.
还有改进的余地。

Technical advances improve productivity.
技术进步提高生产力。

Her service has improved.
她的发球有了提高。

system是什么意思：
n. 体系，系统；设备；制度；方法；身体；次序

Is the system unstable?
是系统不稳定吗？

It was not a perfect system.
它不是一个完美的系统。

This is a sexpartite system.
这是一个由六部分组成的系统。

ipo是什么意思：
=International Projects Office (北大西洋公约组织)国际规划局

Even if the IPO bonanza were to peter out, there would be other opportunities.
即使IPO这块肥肉已经被分光了，其他的机会还是存在的。

"assist in mergers, acquisitions, corporate restructuring and IPOs."
在企业合并、收购、重组和上市的过程中提供帮助.

IPO underpricng is referred to an average excess return, statistically significantly positive, of a new issue immediately aftermarket relative to its offering price.
所谓新股发行抑价，是指首次公开发行的新股上市后，其二级市场价格相对一级市场发行价格，在统计上所存在的显著为正的平均超额收益。