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Faced with the challenges caused by __ graying population,ch

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Faced with the challenges caused by __ graying population,china is considering making
Faced with the challenges caused by _a_ graying population,china is considering making it _a_legal must-do for chinese citizensto visit their aged parents.第一个空为什么不用the?
不是特指,
这跟下面的句子是一个道理
A cat is a mammal.
老龄化是泛指,而且是第一次提及.
下句就是特指的情况
The graying population in china is increasing.
再问: 那如何确定是否是特指?为什么graying population 在句子中不可以是特指?