I suggest reading my article on saving data with the Persistent modules before you tackle this section.
我建议在阅读本节之前，阅读我关于用Persistent模块保存数据的文章。
With the persistent increase in the economy, several large-scale or mid-scale cities have commenced building their own CBDs.
随着经济的持续快速增长，近年来我国一些大中城市纷纷着手建设自己的CBD。
With the persistent increase of the national economy, tourism industry is developing rapidly. Tourism industry is playing a more and more important role in the national economy.
随着国民经济的持续增长，旅游行业正在迅猛发展，并在我国经济增长中发挥着重要的作用。
With the persistent increase of the national economy, tourism industry is developing rapidly. Tourism industry is playing a more and more important role in the national economy.
随着国民经济的持续增长，旅游行业正在迅猛发展，并在我国经济增长中发挥着重要的作用。
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