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大萧条是二十世纪的决定性宏观经济事件,它引发了对宏观经济理论和政策的根本性重新思考。
"The human heart is a battlefield of conflicting emotions."
Around computers it is difficult to find the correct unit of time to measure progress. Some cathedrals took a century to complete. Can you imagine the grandeur and scope of a program that would take as long?