求翻译：在我国，课本使用寿命仅为半年。在国家大力倡导建设节约型社会的今天，实行中小学教科书循环使用，降低教科书使用成本，是一种理智的选择是什么意思？

In China, the textbook life of only six months. At the national advocate for building a conservation-oriented society today, the implementation of primary and secondary school textbooks, recycling, reduce the cost of textbooks is a rational choice

In my life, and textbooks for only six months. national advocacy efforts to create a conservation-oriented society of today, the primary and secondary school textbooks, reduce textbook costs, is a rational choice

In our country, the textbook service life is only half year.Initiates the construction in the country to save society's today vigorously, implements the elementary and middle schools textbook circulation use, reduces the textbook use cost, is one kind of reason choice

In our country, the textbook life of only six months. State energetically advocate economizing today, implementation of primary and middle school textbook recycling, reduce textbook costs, is a rational choice

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