Law of Library Science and the Labor-saving Principle, and connecting with the reality, discusses on the directive function of No.
简述了图书馆学第四定律和省力法则的内涵，联系实际，讨论了目前网络环境下第四定律对图书馆工作的指导意义。
The paper using the related social theory analyze that the cause of the media focus's emergence is social stratification, media competition, the impact of labor-saving principle.
论文中利用社会学的相关理论分析传媒分众化出现的原因，揭示出传媒分众化的出现受到社会分层、媒体竞争、省力原则的影响；
It is saving cost that creates the wealth ultimately. Smith's principle that division of labor creates wealth is only one way to save cost.
节约成本是创造财富的根本原因，斯密的分工创造财富的原理仅是节约成本的方式。
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