FileOutputStream * 来模拟一下BufferedReader * 键盘 System.in，硬盘 FileStream，内存ArrayStream。 .
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在接下来解释之前先用绘画来模拟一下似乎比较好。
In the explanation that follows it seems fitting to begin with a painting analogy.
让我们来模拟一下这个场景，假设对象在DASD中存储6个月，在外部存储中存储3年，在磁带中存储7年。
Let's simulate this scenario, assuming that objects stay six months in DASD, three years in external storage, and seven years in tapes.
美宇航局说，这个太空探索车是去年月球表面太空模拟的必备工具。 这一工具可以改造一下，安装在一个飞行平台来适应小行星探索。
Sans wheels, which were needed for last year’s simulations to the surface of the moon, the vehicle could be transformed for asteroid exploration by mounting it on a flying platform, says NASA.
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