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The first is a single integer, and the other is an unbounded sequence of integers.
第一个是单个整数，而另一个是一个无限制的整数序列。
An element of the Topic type, as shown in the following figure, contains an unbounded sequence of elements.
如下图所示，Topic类型的一个元素包含一个不受限制的元素序列。
An unbounded sequence can hold any number of elements, constrained only by the limits of your platform memory.
一个无限序列可以拥有任意多个元素，只会受到平台内存大小的限制。
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