First of all, people began to realize the population problem.
首先，人们开始认识到了人口问题。
They never knew that the population problem would become so serious.
他们根本不知道人口问题会变得这么严重。
The population problem is a world problem.
人口问题是一个世界性的问题。
The population problem may be the greatest one in the world today.
人口问题可能是当今世界上最大的一个问题。
The population problem may be the greatest one of the world today.
人口问题也许是当今世界上最严重的问题。
The population problem may be the greatest one of the world today.
人口问题也许是当今世界上最严重的问题。
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