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Calculator
計算器
A calculator is a device for calculations in math.
計算器是數學上用于計算的工具。
It is not a computer.
它不是計算機。
And it is usually small, digital and inexpensive.
它通常是小巧且廉價的電子產品。
Many students use calculators for their school work.
許多學生用計算器做作業。
The first pocket-size calculator appeared in about 1970 around the world.
世界上第一款袖珍計算器大約出現在1970年。
Because it was powered by batteries, it was portable, handy and very convenient.
因為計算機是電池充電，所以它可移動，非常方便快捷。
However, it was very expensive.
然而，當時計算器很貴。
It cost almost 400 $.
它的價格約是400美元。
