这款节能灯的发光效率达到了90流明每瓦，非常令人印象深刻。

This energy-saving bulb achieves 90 ___WPC, which is very impressive.

这家工厂安装了新的水污染控制系统以符合环保标准。

The factory installed a new ___w.p.c. system to meet environmental standards.