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应该采取适当的措施限制外国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。 Proper measures must be taken to limit the number of foreign tourists and the great efforts should be made to protect local environment and history from the harmful effects of international tourism. 越来越多的人开始意识到财富不是幸福的惟一先决条件。 A growing number of people are beginning to realize that wealth is not the sole prerequisite for happiness . 无可否认，空气污染是一个极其严重的问题：城市当局应该采取有力措施来解决它。 There is no denying the fact that air pollution is an extremely serious problem: the city authorities should take strong measures to deal with it. 通货膨胀又是一个我们必须学会面对的痛苦的新情况。 Inflation is yet another new and bitter truth we must learn to face . 既然世界上许多国家仍被饥饿和贫困所困扰，为什么有的政府还坚持花费数十亿美元用于太空探索?现在越来越多的人提出这个问题。 Why do some governments persist in spending billions of dollars on space exploration when starvation and poverty continue to grip many countries throughout the world? This particular question is being raised by an ever increasing number of people. | 
