在过去的几个世纪中，人类的知识量呈指数状增加。
The amount of human knowledge has increased exponentially over the past few centuries.
由于我国首次推出这一品种，有必要对股指期货以及指数现货的一些背景知识给出介绍。
Because it is the first time that China release stock index future, we should know the background of stock index future.
由于我国首次推出这一品种，有必要对股指期货以及指数现货的一些背景知识给出介绍。
Because it is the first time that China release stock index future, we should know the background of stock index future.
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