Explain the following definition of language: is a system of arbitrary symbols used for human communication.

Explain the following definition of language: is a system of arbitrary symbols used for human communication.

1）First of all, language is a system, i. e, elements of language are combined according to rules. This explains why "ibik"is not a possible sound combination in English.
2）Second, language is arbiirary in the sense that there is no intrinsic connection between the word"pen"and the thing we use to write with. The fact that different languages have different words for the same object is a good illustration of the arbitrary nature of language.
3） Third, language is vocal because the primary medium is sound for all languages, matter how well developed their writing systems are.
4） The term"human"in the definition is meant to specify that language is human-specific, i. e, it is very different from the communication systems other forms of life possess, such as bird songs and bee dances.
评分标准：每个要点占2.5分；解释不当，酌情扣分。