在写一些文章时，不可避免的会有一些核心概念，避免重复。
①人口增长 野生动物 灭绝 构成威胁
THE UPS AND DOWNS OF POPULATION GROWTH
背诵9
The two charts show that the ①increase in the U.S. population has been accompanied by a corresponding decline in the number of wildlife species. Far too many species have been lost already. This poses a danger to the ecological balance.
As the human population ②expands, more and more wild animals are hunted for food, or because they are thought to present a threat to man. But studies show that one of the primary causes of the disappearance of wildlife is pollution, which is one of the consequences of population ③growth and economic development. This makes us wonder if man is able to share this planet in harmony with other life forms.
In my opinion, it is imperative(迫切的) to take steps to reverse the disturbing(令人困惑的) trend illustrated in the charts. One measure would be to forbid the building of cities in areas where wild life is threatened with extinction. But, more importantly, man must learn to stop polluting the environment, or he himself will become extinct. 背诵9

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