实践表明，这种基于复合加密的公钥密码系统，算法的时间复杂度和空间复杂度并未受到影响，但其安全性较早期各同类系统更高、更易被用户采纳。
It is proved that this public key cryptosystem based on compound encryption has not been influenced on time complexity and space complexity, but it has more security t.
由于是一个典型的力伺服系统，而且在仿真实验过程中需要模拟各种载荷的变化情况，电液伺服加载系统是一个相当复杂的机—电—液复合系统。
As a typical servo system for simulating various loads in the experiment, the electro-hydraulic loading system is quite a complex machine-electricity-hydraulic multiple system.
城市环境—生态系统是高度复杂的时空复合动力学系统。
Urban environmental ecological system is a singularly complicated, spatial and temporal multiple dynamic system.
城市环境—生态系统是高度复杂的时空复合动力学系统。
Urban environmental ecological system is a singularly complicated, spatial and temporal multiple dynamic system.
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