农产品产量波动：灾害所致还是收购价格所致?。

Which Leads to the Output Fluctuation of Agricultural Products, Calamity or Purchasing Price?

youdao

该方法实用性强，适用于压裂前产量波动比较大的油井。

These models are applicable especially for the case of great fluctuation in oil production of a well before fracturing.

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气候异常导致气候灾害频发是华东地区水稻产量波动的主要原因。

The main causes of rice yield fluctuate were the increasing of climatic disasters due to unusual climate changes in East China.

youdao

And so the whole definition of what a recession is is evolving and... we could be in a similar kind of situation where job...number of jobs goes up or down and maybe output doesn't.

因此，经济衰退的完整定义,不是一成不变的。,有时可能出现这种情况,失业率也会上升或下降,而国民产量并无波动。

斯坦福公开课 - 经济学课程节选