19世纪初美国邮政使用了气动管精密系统，但伦敦使用了完全不同的方式，建立了这个小规模的铁路系统，只能用于包裹运输使用。
The USPS used an elaborate system ofpneumatic tubes during the early 19th century, but London took anentirely different approach and built this scaled-down railroad systemto be used only for parcels.
您会发现一个新创建的包裹，以及一个创建用于显示steps . txt文件中定义的过程步骤的UML活动图。
You'll find a new package created, together with a UML activity diagram created that represents the process steps defined in the steps.txt file.
因为过于昂贵，除了极少量的用于人们的口腔，或包裹在手指上抑或悬挂在耳根，黄金无法在工业或商业领域得到广泛使用。
It's too expensive to use widely in industry or commerce, except for tiny amounts that go into people's mouths, wrap around their fingers, or hang from their ears.
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