And so a punch card can hold about 80 characters, and you can fit about 2,000 or so cards into a box, and you put them in, say, my home region of New England, it would cover the entire region up to a depth of a little less than five kilometers, which is about three times deeper than the glaciers during the last ice age about 20,000 years ago.
一个打孔卡大约能写下 80个字母 一个盒子大约可以装下2000张卡片 然后你把它们放到 比如 我的家乡新英格兰 大概会以将近 5千米的深度覆盖整个地区 这大约是上一个冰河时期 冰川厚度的三倍 那大约是两万年前