discharge orifice meaning in English

流量孔板
流水孔
排出孔
排出口
排放孔
排泄孔
喷口
泄流孔
泄水孔

It is pointed out that the increase of the pollutional quantity is caused by socioeconomic development , non - effective execution of laws and national policies , slow progress in pollution control , increase of pollution discharge orifices and so on
指出造成排污量增大的原因是：社会经济快速发展，入河排污口数量增多，查处违法不严，贯彻国家政策不力，对水污染治理滞后等。