Language is [填空1]--there is no intrinsic connection between a sound and its meaning.
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Language is [填空1]--sound is the primary medium for all languages.
Language is[填空1]. Words symbolize objects, actions, and ideas by convention.
Language is human [填空1], which is very different from other means of communication systems by other species.
In linguistics, construction is both a [填空1] and a [填空2]. The former is how a word, a phrase, or a sentence is formed and the latter the result of it.