限制原因主要在于违反了疑问语气的语用原则。

The reason for selectivity lies mainly in the violation of pragmatic principle for interrogative mood.

从语言的商讨性角度来讨论广告者选择祈使句式的语用原则和策略，指出广告者灵活运用听者礼貌模型和一定的用法策略，是广告祈使句在广告中取得成功的主要原因。

Therefore the pragmatic principles and strategies employed by the advertisers in choosing imperative sentences among the others from the perspective of negotiability of language are discussed.

说话人话语与意图合作是普遍的语用原则。

Speaker's words and intention cooperation are that general principle of pragmatics .

委婉语的语言特征还属于语用学中人与人交际的范畴 ，与“社会语境”、“合作原则”、以及“礼貌原则”等主要语用原则有着密不可分的关系。

The language features of euphemism belong to the communicative category expounded in pragmatics, and are closely related to such rules as so…

在商务信函交往中，我们需要运用语用原则的策略来共同指导各类商务信函的写作。

In English business letters communications, it's necessary to apply the strategies of the principles of pragmatics to guide the business letters writing.