card-index

基本解释

During the 1920s Fisher became rich from the invention and sale of a card-index system.
在20世纪20年代，费雪因为发明和销售卡片索引系统成了富翁。
The librarians have compiled a card-index catalogue so that they can afford facilities for reference.
为便于参考起见，图书馆馆员们编制了索引目录卡。
During the 1920s Fisher became rich from the invention and sale of a card-index system. He used the money to buy stocks on margin, and by 1929 was worth $10m.
19世纪20年代费雪因为发明并出售一种卡片索引系统而变得富有。

The index tracks credit-card purchases of diesel fuel at truckstops across the country and provides a real-time indication of how much freight is moving from ports and factories to consumers.
FORBES: Truckers Say Market's Wrong, Economy Grows
As the Fiscal Cliff debate diffuses into so many Three-Card Monte games during 2013, perhaps the clarity of the Government Affordability Index can prevent us from being tricked, over and over and over again.
FORBES: We Need To Reign In The Government Affordability Index

A card index is a number of cards with information written on them which are arranged in a particular order, usually alphabetical, so that you can find the information you want easily.