America is a less developed country.

美国是一个较不发达的国家。

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The vicious circle theory describes the less developed country as trapped in its own poverty .

恶性循环理论认为，不发达国家陷入了自身贫困的罗网之中。

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The number of people searching for work in a less developed country depends primarily on the size and age composition of its population.

在欠发达国家中，寻求职业的人数主要取决于该国人口数量的多少与年龄结构。

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The next big thing for retailers in China will be the less-developed cities of the country's interior.

ECONOMIST: Retail in China

In such an economic environment, the up-front costs of environmental protection can appear daunting, particularly for officials in the less-developed interior of the country with far fewer economic resources.

CNN: Economic miracle, environmental disaster

So, back to the Baby Bust, the question must be considered as to why we should change the clear trend in any developed country to have less people who lead happier lives?

FORBES: America's Baby Bust - Busted. Immigrants Are The Answer And The Next Generation Of Entrepreneurs