internal cause and external cause 内部动因与外部动因
The second step is to choose the best method which combined universality and specialization, progress and complication, internal and external cause, short-term and long-term interests together.
其次讲究方法，乡风文明建设应兼顾普遍性和特殊性、前进性和曲折性、内因与外因、短期利益与长远利益；
CONCLUSION: Structure weak area of tooth was the internal cause of cracked-teeth occurrence, and traumatic occlusal force was the external factor tha.
结论：牙结构的薄弱环节是牙隐裂发生的内在因素，创伤性(？)力是促使牙隐裂发生的外在动力。
Then, on the pretext of this supposition, the thesis summarizes the cause of generation of Verb-copying sentence: internal cause and external cause.
其次，有在生成的基础上总结了重动句的生成原因：内部义素和外部因素。
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