常规关系作为一种共有的背景知识，在语言交际过程中往往不被明说，而是隐藏在一些被称为“前提触发语”的词汇或表达式中。

As some shared knowledge to the language participants, stereotypical relations are usually not said explicitly but embedded in some lexical items or expressions known as presupposition triggers.

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触发预设的这些词汇或语法表达方式叫做预设触发语。

The lexical items or grammatical expressions that trigger presuppositions are presupposition triggers.

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