To recognize the twifold features of teaching habits ;

认识教学习惯的 双重特征；

An effect of laser energy enhancement occurs in dual-modular the output energy of dual-modular is 15 % higher than twifold energy of single modular .

实验表明双模块器件存在很强的激光脉冲能量增强效应，双模块串联输出的激光能量比单模块 激光能量的两倍还 大15%。

Second twifold of privacy nature .

第二，隐私权性质的 双重 化。