Abstract: Casing failure occurs frequently during the hydraulic fracturing process of shale gas formation, which seriously influences the shale gas recovery efficiency.
摘要：在页岩气开采的水力压裂过程中，套损时有发生，严重影响页岩气开采效率。
Pragmatic failure frequently occurs in English learners' speech.
语用失误频繁地出现于英语学习者的话语中。
Conventional printer characterisation models are generally based on the assumption that the densities of primary colours are additive. However, additivity failure frequently occurs in practice.
传统的彩色打印系统特征化模型通常基于打印基色的色密度具有加和性的假设，然而实际中叠加特性缺失的现象经常出现。
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