Back then, people need to do more number crunching their head, these day, with smartphone and digital calculator, has been replaced this demand.
那时候，人们需要做更多的数字运算，如今，智能手机和数字计算器已经取代了这一需求。
Digital calculator
原声例句
雅思口语高分榜样
英语百科
Calculator
An electronic calculator is a small, portable electronic device used to perform both basic operations of arithmetic and complex mathematical operations.
The first solid state electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus (developed around 2000 BC), and the mechanical calculator (developed in the 17th century AD). It was developed in parallel with the analog computers of the day.
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