There are three frontiers. First is production frontier.
反哺边界有三条：一是生产边界。
In this case, the production possibilities frontier is also the consumption possibilities frontier.
这种情况下，产能界限图和耗能界限图是同一张。
Economic growth is an outward shift of a country's production possibility frontier.
经济增长是一个国家生产临界线向外的延伸。
This graph is the farmer's production possibilities frontier.
该图即为此农夫的生产能力界限图。
Production has fallen as China has reached something of an environmental frontier.
产量的下降是因为中国已经达到了环境可供给的最大限度。
Production has fallen as China has reached something of an environmental frontier.
产量的下降是因为中国已经达到了环境可供给的最大限度。
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