Method: Retrospective analysis on the clinic datas of 86 cases with trephination and drainage treatment for acute epidural hematoma in our hospital were reviewed.
方法：对我院采用钻孔引流手术治疗急性硬膜外血肿86例的临床资料进行回顾性总结。
2
Experimental researches on the reuse of filter backwashing water are carried through by giving a thorough analysis to the drainage technology in Xinkaihe Waterworks.
通过对新开河水厂排水工艺的深入分析，进行了滤池反冲洗水回用的试验研究。
3
Some key technical problems have been amended, for example, leakage of hydraulic pressure bursa, control of drainage, analysis of apparatus system error, design of accessorial equipments, and so on.