The population problem is a world problem.
人口问题是一个世界性的问题。
Population problem is seen as a high priority.
人口问题被看成是一个重要问题。
Any population problem not only exists in its own system.
任何人口问题，都不仅仅是人口系统内部的问题。
First of all, people began to realize the population problem.
首先，人们开始认识到了人口问题。
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。
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。
This course will further explain and analyze this world population problem.
这门课程将会进一步解释并分析这一世界人口问题。
Some have advocated such a procedure as a solution to the population problem.
有些人曾提倡把这一步聚作为解决人口问题的一项办法。
It is a crippling population problem that could be worse than any global economic slowdown.
人口年龄层失衡的问题，将比全球经济衰退更严重。
Population is our biggest problem.
人口是我们的最大问题。
This is a major problem because Saudi Arabia is about to see its population explode.
这是个主要问题，因为沙特阿拉伯将要经历自己的人口激增。
Population growth will make the problem worse. So will climate change.
人口增加和气候变化都会让水危机恶化。
But by far our most serious problem is a declining and aging population.
但是到目前为止，我们最严重的社会问题是人口下降问题和老龄化的问题。
The most important world problem is the rapidly increase of population.
世界上最为重要的问题是人口的迅速增长。
They never knew that population would become a big problem.
他们从没意识到人口会成为一个大问题。
They never knew that population would be a big problem.
他们从来没想过人口会成为一个大问题。
The problem, though, is that these are population studies.
问题是这些仅仅是人口调查。
America has a big problem, a population replacement process in progress.
美国有一个大问题，那就是正在发生的人口更替过程。
The use of various energy sources is the final problem stemming from human population growth.
源于人口增长的最终问题是如何使用不同的能源资源。
They never knew that population would become a big problem.
他们从来都不知道人口问题将会成为一个大问题。
Injury is an important public health problem which threatens the health of elderly population.
伤害是危害老年人群健康的一个重大的公共卫生问题。
But an increasing population is an environmental problem in many countries.
但是日益增长的人口是许多国家的环境问题。
But an increasing population is an environmental problem in many countries.
但是日益增长的人口是许多国家的环境问题。
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