如果rand是一个线性同余随机数序列，显示的图案，这意味着在任何给定的时间，这是不正确的，所有的数字都是等概率的。
If rand is a linear congruential RNG, number sequences show a pattern which means that at any given time it is not true that all the Numbers are equiprobable.
查询语句的优化就是对于给定的查询，选择代价最小的操作序列，使查询过程既节省时间，又节省空间。
The optimization of query sentences is to select operation sequence with minimal costs in terms of given query so as to make query a time-saving and space-saving process.
该问题可描述为给定某个的时间序列，要求从一个大型时间序列数据库中找出与之最相似的序列。
The problem can be described as: searching the sequence most similar to a given time series from a large time series database.
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