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Историческую версию Green Calculator можно получить на Android
Для изменения окружающей среды, чтобы изменить судьбу Земли.
With the basic functions of the engineering calculator and the ability to customize the engineering function button innovation.
Mobile phone replacement calculator can save the purchase of the calculator money can also be environmentally friendly, if all the electronic application tools can be replaced with mobile phones, the world is more environmentally friendly, for which I use App to promote this concept.