I totaled my expenses with a calculator. 我用計算器算出開(kāi)支的總金額。
Suppose that you receive the calculator for testing and find that besides addition, subtraction, multiplication, and division, it also performs square roots. 假如您收到的測試用計算器除了能加法，減法，乘法，除法以外還能做平方根運算。
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