Langue or competence is （）and not directly observed, while parole or performance is concrete and directly observable.
According to Chomsky, competence is “the speaker-hearer’s knowledge of his language ” while （）is “the actual use of language in concrete situations”.
The（）relation is a kind of relation between linguistic forms in a sentence and linguistic forms outside the sentence.
A（）study of a language is concerned with the historical development of the language over a long period of time.
For communication, the sense of （）is more adaptable than that of touch.
术语翻译题
productivity
Translate the following terms from English into Chinese.
Interchangeability
displacement
问答题
Name at least three of the design features of language and explain them.
duality of structure
Duality or double articulation
术语翻译题：将下列术语译成汉语。
discreteness
cultural transmissions
Language is a system of （）vocal symbols by means of which the members of a speech community communicate, and transmit their culture.
What a speaker actually says is his （）linguistic behavior.
According to Chomsky, （ ）is "the speaker-heater's knowledge of his language".
According to Saussure, （ ）refers to the concrete act of speaking in actual situation by an individual speaker.
（）was traditional grammar's key tone.
Traditional grammar was based upon earlier grammar of （）or Greek.
（）language can be equally communicative even when they do not accompany language.