The book is full of detail about the rise and fall of firms, technologies, and industries, but it does not rise to the status of a theoryof business cycles.
此书充斥企业、技术和产业起落的细节，但没有上升到经济周期理论的地位。
2
Another theory is that worldwide temperature increases are upsetting the breeding cyclesof frogs.
另一种理论是世界范围温度的升高破坏了青蛙的生长循环。
3
In this theory, boom-burst cycles are a sign of progress.