在粮食生产上，这个国家完全做到了自给自足。
农田生产力的提高使一些国家在粮食和牲畜方面能自给自足，并为防止饥荒提供了有效的保护。
The increased productivity from farmland made some countries self-sufficient in grain and livestock, and offered effective protection against famine.
正如一次回升需要一个关于生产，收入和支出都处于上升的自给循环，对衰退来说，正是反之亦然。
Just as a recovery needs a self-supporting cycle of rising production, income and spending, so a recession needs the opposite.
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