虽然激光雕刻解可以降低维护的成本，但是仍需要定期地维护和保养，才能保证设备的长期使用。
Although one of the major benefits of laser engraving is reduced maintenance worries, regular preventative maintenance still remains a must.
本文对降膜式蒸发设备中的热压泵就其理论计算过程及其设计注意事项作了比较详细的介绍，经长期使用效果良好。
In this article, the theoretical calculation and the design notices for the heat pumps used in the film evaporation equipment were introduced in detail.
存在使用ICD的标准指证但是不想接受这类治疗是患者长期使用这类设备的基本条件。
The use of this type of device long term has been postulated in patients who have a standard indication for an ICD but don't want one.
存在使用ICD的标准指证但是不想接受这类治疗是患者长期使用这类设备的基本条件。
The use of this type of device long term has been postulated in patients who have a standard indication for an ICD but don't want one.
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