Language is[填空1]. Words symbolize objects, actions, and ideas by convention.
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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.
Immediate Constituents refer to the constituents [填空1], [填空2], below the level of a construction.
The immediate constituents of the sentence “ My best friend is studying abroad.” are [填空1] and [填空2].