By（）is meant the property of having two levels of structures, such that units of the primary level are composed of elements of the secondary level and each of the two levels has its own principles of organization.

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正确答案：duality

Tag：英语语言学概论时间：2022-01-12 21:58:44

上一篇：In broad terms, linguists agree to define language as a system of（）vocal symbols used for human communication.
下一篇：（）means that human languages enable their users to symbolize objects, events and concepts which are not present (in time and space) at the moment of communication.