In the old days, a designer working on an airplane wing handed a bunch of punch cards to the computer operator and waited a week to get back thousands of numbers on fanfold paper.

那时候，一个设计飞机机翼的工程师会把一孔卡片交电脑操作，一个星期才能拿回来成千万的数字，而且是写在复写纸的。