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1·A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels.

分贝通常表示两个声音信号或电力信号在功率或强度方面的相对差别的单位，相当于两个水平的比率的常用对数的十倍。

2·Proxy signature systems have great applications in e-business whose secure-ty is based on the difficulty of integer factoring or the difficulty of solving the common discrete logarithm problem.

代理签名体制在电子商务中的应用很广泛，目前的代理签名体制安全性主要是基于求解大数因子分解问题的困难性或求解离散对数问题的困难性。

3·Common Mathematical Functions: Logarithm, Power, Exponential, Reciprocal, Square Root 8!

常见的数学函数：对数，功率，指数，互惠的，平方根8 ！