汉语中与否定有关的现象都可以由衍推关系得到解释。
Some phenomena of negation in Chinese can be explained by entailment.
合作原则、礼貌原则及言语得体都离不开语境系统的制约，并提出言语交际的原则是语境顺应原则和语义、语用衍推原则。
Furthermore, this paper put forwards the principles of speech communication: context adaptation principle and semantic and pragmatic derivative principle.
本文指出了周衍柏编《理论力学教程》第二版中计算力学体系约束力的两处公式的推证错误；
In this paper two erroneous formulas, which discuss constraint forces of mechanical system in Theoretical Mechanics second edition write by Zhou Yengbor, have been indicated and analyzed.
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