年久的弹头到了2008年将达到设计的30年使用期，这些旧弹头也就在没有危害国家的核屏蔽的情况下被淘汰。
The older warheads, the most elderly of which will reach the end of their 30-year design lifespan in 2008, could then be retired without compromising the country's nuclear shield.
所以我们来对屏蔽举两个例子，如果我们在讨论氦，举例来说一个氦原子核或者氦原子。
So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
它们受到少的屏蔽,因为它们离原子核更近，它们感觉到一个更大的有效电荷量。
They're less shielded because they're closer to the nucleus, they feel a greater z effective.
我也想指出的一点是它们不同的方式,有效的z事实上不同于原子核的，总电荷量,因为屏蔽效应。
And the point that I also want to make is the way that they differ, z effective actually differs from the total charge in the nucleus due to an idea called shielding.
像电脑核病毒。撒马利亚人屏蔽了该代码以保护自己。
Like a nuclear virus. Samaritan quarantined the code to protect itself.
对超高屏蔽核测用电缆屏蔽设计中的几个重要问题进行了分析。
Furthermore some important problems in the shielding design of the cable are analyzed.
以某型乏燃料运输容器为计算模型，对其进行了临界安全、核热分布以及辐射屏蔽计算，并对临界计算和屏蔽计算的部分参数进行了敏感性分析。
Taking a spent fuel shipping cask as calculated model, detailed criticality safety, nuclear heat distribution and shielding calculations and sensitivity analysis of some parameters were performed.
以某型乏燃料运输容器为计算模型，对其进行了临界安全、核热分布以及辐射屏蔽计算，并对临界计算和屏蔽计算的部分参数进行了敏感性分析。
Taking a spent fuel shipping cask as calculated model, detailed criticality safety, nuclear heat distribution and shielding calculations and sensitivity analysis of some parameters were performed.
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