1. use of the smart To use it, must carefully consider to good effect. The effect of scarcity or rarity in the future. Again, consider a master of Economics to the cost and yield. 2. Save (keeping reserve) refers to a rare resource, which has fewer or rare should be preserved to ensure lost. Sometimes, if there is some kind of fit are used. Must be used wisely? 3. refresh the environment is bad or deteriorated for the better (repair update), that is, any resource conditions precarious or endangered is if the action is not theoretically correct. Should find a way to improve, are in a better manner.
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