It is doubtful that any american president would follow the example of the chinese emperor qianlong , who announced in 1793 that the then economic superpower had no interest in “ foreign manufactures ” , setting his country on the road to two centuries of impoverishment 历届美国总统能否跟从中国乾隆皇帝的例子是值得怀疑的， 1793年乾隆皇帝宣布他的超级经济大国对“外国制造”不敢兴趣，从而使其国家走上了两个多世纪的贫穷道路。
Via researches symans and sadek pointed out that for flexible structures ( structures with periods beyond 1 . 5s ) such a semiactive control system can be effective in reducing both the relative displacement and the absolute acceleration , whereas for rigid structures ( structures with periods below 1 . 5s ) it is doubtful Symans和sadek等人通过研究指出，对于柔性结构(周期在1 . 5s以上)变阻尼控制可以同时减小结构的位移反应和加速度反应；相反对于刚性结构（周期在1 ss以下）其效果如何则是值得怀疑的。
It was the best of times , it was the worst of times ; it was the age of wisdom , it was the age of foolishness ; it was the epoch of belief , it was the epoch of incredulity ; it was the season of light , it was the season of darkness ; it was the spring of hope , it was the winter of despair ; we had everything before us , we had nothing before us ; we were all going direct to heaven , we were all going direct the other way 这是个好时代也是个坏时代；这是个聪明的年龄也是个愚蠢的年龄；这是个值得信任的时期也是个值得怀疑的时期；这是个明媚的季节也是个灰暗的季节；这里有春天的希望也有冬日的阴霾；我们的面前什么都有也一无所有；我们可能直接进入天堂也可能下地狱。
Based on trimming the theoretical history of western economics , the dissertation sums up and expounds diverging arguments about the definition of monopoly , differing analyzing approaches and varied antimonopoly policies , then comes to the conclusion that monopoly in economic life does not exist and points that it is questionable to regulate monopoly in economic field 本文通过经济学说史的研究,对垄断观念在垄断概念、垄断分析方法和反垄断政策实施中的观念分歧进行归纳和阐述,论证了经济垄断不存在,对经济垄断进行管制是值得怀疑的观点。
It is posited that china has followed the path of labour - intensive , export - oriented industrialization on the basis of endowment - determined international comparative advantage , which is in turn posited to be manifestation of the " natural development " . the problem with this view , however , is that it begs the question as to why such a presumably easy process has not occurred in the wider developing world 而仔细观察改革开放以来中国外贸发展的实际情况，特别是出口商品结构的变化就会发现，中国的外贸出口并非依照主流系统所认定的那样符合所谓禀赋国际比较优势，即劳动密集产品所主导，而且，西方主流系统对所谓“中国模式”的解释也是值得怀疑的。
