Human language has two levels of structures, such as, 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. Language is hierarchical. It indicates ______ of human language.

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Human language has two levels of structures, such as, 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. Language is hierarchical. It indicates ______ of human language.

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English is the international language of science, technology, and human relations

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A ( ) translates a computer program written in a human-readable computer language into a form that a computer can execute.

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A language lesson plan usually has the following components except _____.

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Science has made（　） possible for machines to take the place of human labour.

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