Euphemism is a mental phenomenon and study on its mechanism should be based on cognitive explanation.
委婉是人的心理现象，对委婉机制的研究离不开对认知心理的解释。
A tentative analysis of the mechanism of mantle circulation flow, continent drifting and earthquake origin is first clearly made, giving a simple mechanics-based explanation of the nature.
首先对地幔对流、大陆漂移和地震起源的机制做了尝试性分析，给出一个简单的力学解释。
It is based on the lexical level to find its pragmatic mechanism, to point out its pragmatic essence, and try to make a systematic explanation on such lexis with uncertain meanings.
以其词汇层面为基点，结合语用机制，指出其语用实质，并尝试对这一类话语中语义不明确的词汇作出系统阐释。
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