...语与目标语之间的差gⅡ；（2）检验假设（hypothesis．testing），即检验目标语的运作｝（3）元语言作用（metalinguistic effect），即帮助学习者消化语言知识。写作作为一种书面的语言输出形式，只要设计舍理，便可以有效地激活这三种功能。
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古今墨家逻辑研究主体、对象、元语言工具、成果形态、层次、方法、作用、后果和评价等元性质，有根本差异。
There are many differences between the study on subject, object, meta-language tool, the form of achievement, ways, function and evaluation etc of the Logic in old times and in modern times.
本文通过分析认为，元语言在叙事小说的叙述与评论中发挥着重要作用。
This paper discusses the narrative and evaluative comments making use of metalingual and metalinguistic devices and proposes that such devices play important roles in narrative fiction.
符号在深层意义上是人类文化的源代码，符号学便作为人类文化的元语言而发挥作用。
Symbol is the code of human culture; semiology behaves as the metalanguage of human culture.
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