At first, these were chunky devices, some needing mains power to operate. But they will portable and could perform basic tasks like adding, subtracting, dividing, and multiplying.

起初，这些都是笨重的设备，有些需要主电源才能运行。但它们可以携带，并可以执行如添加、减去、除以和乘以的基本任务。

They have done something to it – added, subtracted, changed it somehow.

他们对它做了一些事情——添加、减去、以某种方式改变它。

" Calculations" are the numbers that you add, subtract, multiply, or divide in order to solve a math problem.

” “计算” 是您为解决数学问题而加、减、乘或除的数字。

In the 17th, 18th, and 19th centuries, many mechanical calculators were developed, though with little success until the arrival of the arithmometer, a portable and reliable mechanical device that could add, subtract, multiply, and divide numbers.

在17、18和19世纪，开发了很多机械计算器，但在四则计算器到来之前几乎都没有成功，四则计算器是一种便携式且可靠的机械装置，可以对数字进行加、减、乘和除。

" To crunch the numbers" is an informal expression meaning to make or do the calculations – to add, subtract, multiply, and divide what you need to, to find the answer.

“计算数字” 是一个非正式的表达方式， 意思是进行或进行计算——加、减、乘、除你需要做的， 以找到答案。