题目内容
The features that define our human languages can be called [填空1] features, making human languages so distinctive from languages used by other species.
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There is an arbitrary relationship between the sound of a morpheme and its [填空1]
There is a certain[填空1] behind the creation of derivatives and compounds. They are not completely arbitrary.
The design feature of [填空1] means that human languages enable their users to refer to objects, events and concepts which are not present (in time and space) at the moment of communication.
Mkhjli is a non-word in English.
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