这种现象在英语口语当中很常见，以多词结构代替单个词的使用似乎有违人类语言经济性原则。
This phenomenon is especially popular in oral English, and seems somewhat abnormal in that a simpler form abdicates for a complicated one, which is against human desire for economic use of language.
语言简化的理论依据之一是经济性原则。
One of the theories about language simplification is the principle of economy of language.
从语用的角度来看，它符合语言的经济性原则和人们的心理需求，适应了交际的需要。
From the perspective of pragmatics, it meets the needs of convenient communication for its accordance with economical principles and people's psychological requirement.
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