NASA的工程师将科幻小说中的素材变成了现实，他们正在检查太阳帆-这中独特的推进技术最终有一天会使深空任务成为可能。
Making the stuff of science fiction into reality, NASA engineers are testing solar sails — a unique propulsion technology that one day could enable deep space missions.
乐观者说，有半杯水，悲观者说，杯子的一半是空的，工程师说，杯子太大了，它是它所盛装的，液体体积的两倍。
The optimist says the glass is half full, the pessimist says the glass is half empty, the engineer says that glass is twice as large as it needs to hold the fluid it contains.
开始设计一个简单的图形库：要这样做，您需要利用New UML Project向导(图1)在新的UML工程中创建空的模型。
Start by designing a simple graphics library: To do this, create an empty model in a new UML project by using by the new UML project wizard (Figure 1).
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