所以，它们是问题性用例模型的标志。
这个报告承认了问题的严重性。
This report is an acknowledgement of the size of the problem.
然而，他却低估了问题的严重性。
这是个全城性的问题，必须当做紧急事件对待。
This is a citywide problem that has to be addressed as an emergency.
考虑到其笼统性，难怪这类定义会存在问题。
That there are problems with this kind of definition is hardly surprising, given its level of generality.
多数政治问题牵涉到这样或那样的道义性。
Most political questions involve morality in some form or other.
难以客观判定该问题的严重性。
Objective assessment of the severity of the problem was difficult.
汽车犯罪不断增加是个全国性的问题。
对该问题的严重性轻描淡写是错误的。
It would be a mistake to understate the seriousness of the problem.
我们没有意识到这个问题的重要性。
这个问题的复杂性和涉及面之广使我感到惊讶。
他已经试图采取强制性法令来解决该国的问题。
He has tried to impose solutions to the country's problems by fiat.
关于偶然性和自由意志的哲学问题是紧密相联的。
The philosophical problems of chance and of free will are closely related.
人们使用批判性思维来解决问题和评估主张。
People use critical thinking to solve problems and evaluate claims.
我们需要认识到问题的严重性。
我们的问题是“结构性的”，需要很多年才能解决。
Our problems are "structural", and will take many years to solve.
这里的问题也是社会性的：食物的组织和分配、财富和繁荣。
Here, too, the problems are social: the organization and distribution of food, wealth and prosperity.
到目前为止，我们还不知道这个问题的严重性。
人们在面临一个具有挑战性的问题时，作者建议应该做什么？
What does the author suggest one do when faced with a challenging problem?
它用了创造性的方法处理这个问题。
我了解到空气污染问题是全球性的，而且我们可能会耗尽一些自然资源。
I have learnt that the problem of air pollution is universal and that we were likely to run out of some natural resources.
这是一个全球性的问题，所以我认为，我们应该提供一些数据来证明这一点。
Well, it is a global problem, so I thought we ought to provide some statistics that show that.
首先，挑选“有挑战性但不令人沮丧”的问题，并解决它们。
First, choose problems to work on that "challenge but do not frustrate".
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