According to the theory of classical mechanics, the problem of stress concentration of open cell of spherical cover end is always solved by approximate computing formula.
由经典力学理论，对于球形封头开孔应力集中问题，大都采用近似计算公式。
Meanwhile, security is another issue for IP-Enabled sensor network. End to end security is a problem for open network architecture.
于此同时，网络安全也是IP传感器网络面临的问题之一，开放式的网络体系，将会产生端到端的安全问题。
Meanwhile, security is another issue for IP-Enabled sensor network. End to end security is a problem for open network architecture.
于此同时，网络安全也是IP传感器网络面临的问题之一，开放式的网络体系，将会产生端到端的安全问题。
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