研究了密码中的拟完美序列和完美序列与循环差集的关系，用群表示论证明了三族循环差集的存在；进而构造出相应的拟完美序列。
The conception "almost perfect arrays" is proposed and it is shown that the existence of an almost perfect binary array is equivalent to the existence of a certain divisible difference set.
因此，我不能说，这是完美的，或适合序列任何类型的对象。
Thus, I cannot say that it is perfect or fit to serialize any type of object.
线性方法是一种完美漂亮的工具，用它来研究时间序列，有时可以得到令人满意的结果。
Linear methods are pretty good as a tool, which can find some satisfying results in studies of time series analysis.
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