The entire universe of things that could be tested is typically too large to be covered within a given schedule, even more when multiple features are combined and the permutation grows exponentially.
可以进行测试的整个范围通常太大，难以在给定的时间内完成测试工作，当多个特性组合在一起时测试的范围将变得更大，其排列组合呈指数上升。
The permutation is even if the number of inversions it contains is even.
如果一个排列中含有的反序的个数是偶数，则称它为偶排列。
By a proper permutation of such pulses, the final reflectance of even difference could be obtained for gray scale display applications.
通过这种脉冲的适当排列，可得到用于灰度显示的最终等差反射。
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