经过二十来年的生产实践，水采技术不断完善和提高，收到较好的经济效益。
Over the past 20 -odd years, the mining technology has been continuously updated, bringing forth more favourable economic result.
尽管手术方法和假体技术不断完善，切口疝修补术后仍存在很高的复发和感染风险。
Despite advances in surgical technique and prosthetic technologies, the risks for recurrence and infection are high following the repair of incisional ventral hernias.
近年来交流电机控制技术不断完善，交流电机的多项控制指标均能与直流电机控制性能相媲美。
With the continuous improvement of the AC motor control technology, many items of AC motor performance can be matched with DC motor.
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