他总是在包里带一个袖珍计算器。

He always carries a pocket ___calculator in his bag.

我每天都使用计算器和电脑，所以现代技术已成为我生活的一大组成部分。

I use the ___calculator and the computer every day, so modern technology has become a big part of my life.

计算器对于解复杂方程是必不可少的。

A ___calculator is essential for solving complex equations.