calculator for extensive use

例句：

1. 1. The engineer useda calculator to calculate the area of thecircle.
   工程师使用计算器来计算圆的面积。
2. 2. She bought a new calculator for herbirthday.
   她生日买了一台新的计算器。
3. 3.The calculator was very helpful in solving themath problems.
   这台计算器在解决数学问题时非常有帮助。