求翻译：　　2003年7月至2005年2月在黄河发电厂任助理工程师，负责污水的控制。2005年3月至7月，在东京大学进行关于污水分析的专业培训，获培训证书。2005年9月至今，在河南农业研究所工作。是什么意思？

In July 2003 to February 2005 as an assistant in the Yellow River power plant Engineer, responsible for sewage control. In March 2005 to 7 months at the University of Tokyo, on the professional training wastewater analysis, by the training certificate. Since September 2005, in the Henan agricultural

　　From July, 2003 to February, 2005 in the Yellow River power plant let assistant engineer, to be responsible for the sewage the control.From March, 2005 to July, carries on in University of Tokyo about sewage analysis specialized training, attains the training certificate.In September, 2005 until n