______ means that language is a system, which consists of two sets of structures, or two level.
举一反三
- 中国大学MOOC: _________ is one of the design features of human language which refers to the phenomenon that language consists of two levels: a lower level of meaningless individual sounds and a higher level of meaningful units.
- A main bearing consists of two shells which are secured by means of studs and （）.
- 中国大学MOOC: The design feature of __________ refers to the property of having two levels of structures, such that units of the primary level are composed of elements of the secondary level.
- The networking standard works at two levels: the physical level and the protocol level.
- The lubricating system of an internal combustion engine consists of two main divisions.The internal system consists mainly of _____ and _____.