A random variable, such as time in the example above, is associated with properties that are different from those associated with a single value.
随机变量，如上例中的时间，与一些特性相关，这些特性不同于那些与单个值相关的特性。
When viewed from above, you might imagine the shape of islands to be random too, but a look at the following images may make you think again.
而当你从上空俯瞰，一心只认为它们的形状没什么规则，但是下面这些图片或许会改变你的想法哦。
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