The base-ten system used in modern arithmetic originates with the fingers, and linguistic traces of that fact remain in the similarity of "five", "finger" and "fist", and the dual meaning of "digit".
现代代数中使用的十进制源于人类拥有的手指数量，在语言中也存在“five”，“finger”和“fist”的相似现象以及“digit”的双重含义都提供了这样的证据。
Classic secret communication system employed at present usually base the security of communication on the arithmetic complexity.
经典的保密通信系统通常把通信的安全性建立在计算复杂性基础上。
And several design ways of making base-band radar signal, modulating arithmetic of several radar signals and the software design architecture of radar signal experimental system are given out.
给出了产生基带波形的几种设计方案以及几种雷达信号调制算法及软件实现设计图。
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