故障分析表明：经长期使用的叶片在修理厂大修时，为满足叶片摆动量要求在榫头底面涂尼龙胶，会使叶片自振频率有较大幅度下降；
Analysis based on the failure characteristics indicates that the nylon gum on bottom of dovetail and the long term operation can significantly reduce the natural frequency of blade.
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.
经四个转台长期使用验证该设计方法的有效性和合理性，完全满足了高精度转台的需要。
Long period of operation of the four test - turntables has proven that the validity and rationality of the design method fully satisfy the requirements of high precision test turntable.
进口的隧道挖装机经长期使用，液压系统损坏严重。
After long-period use of the imported crawling loaders, the hydraulic systems of the crawling loaders are damaged seriously.
进口的隧道挖装机经长期使用，液压系统损坏严重。
After long-period use of the imported crawling loaders, the hydraulic systems of the crawling loaders are damaged seriously.
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