It was only thirty years ago that the building industry felt confident enough to erect office blocks of steel and reinforced concrete that had more than a dozen floors.
建筑行业是从30年前才开始有信心建造超过12层楼高的钢筋混凝土结构的办公大楼。
In a German study, eighty per cent of those surveyed described themselves as confident in their answers on a questionnaire, yet only forty-two per cent got even half the questions right.
在一项德国人的研究中，虽然百分八十的受访者对于自己在问卷调查中的回答抱有自信，只有百分之四十二的人能答对其中一半的问题就不错了。
His file told me some, but after watching him for only a few days, I feel confident in saying that I know things no one else does.
他的文件告诉了我一些，但是在仅仅观察他几天之后，我很自信地说我知道其他任何人都不知道的东西。
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