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在足量原则作用下,字面义表示[许可]的情态结构可以隐涵[非必要],表示[免除]的情态结构可以隐涵[非禁止],这两种隐涵义对语境的依赖较小。在不过量原则的作用下,[许可]可以隐涵[必要],[免除]可以隐涵[禁止],这两种隐涵义对语境的依赖较大,只有在面子威胁语境中才能被激活。根据礼貌原则,如果话语有可能威胁到听话人的面子,说话人倾向于使用信息量较小的表达方式。这种现象不但存在于道义情态范畴,也存在于其他具有信息量等级性的范畴中。
Under the principle of sufficient principle, the modal structure of the [permit] can be implied [non-essential] in the literal sense, the modality of the structure of [exemption] can be implicit [non-forbidden], and the dependence of the two implicit meanings on the context small. Under the principle of excessive quantity, [permission] can be implied [necessary], [exempt] can be implied [prohibited], and these two implicit meanings have greater reliance on context and can only be used in the face-threat context activation. According to the politeness principle, if discourse threatens the face of the listener, the speaker tends to use a less informative way. This phenomenon exists not only in the category of moral modality, but also in other categories of information-scale.