The problem: accessing the next element in the lazy sequence has some management overhead.
但是有一个问题：在lazysequence中访问下一个元素可能会有一些数据管理上的开销。
Range creates a lazy sequence that generates all the Numbers in the given interval; take asks the sequence 10 times for the next element.
range创建了一个lazysequence，这个lazy sequence会预生成好指定范围内的10个数。然后，take会请求10次sequence来获取生成的数。
Range creates a lazy sequence that generates all the Numbers in the given interval; take asks the sequence 10 times for the next element.
range创建了一个lazysequence，这个lazy sequence会预生成好指定范围内的10个数。然后，take会请求10次sequence来获取生成的数。
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