如果可以完全建立起那样一个保护系统，就能足以保证美国的安全，这样一个想法一直以来是牵强的。
Yet any idea that 【 such a shield, if it can be constructed at all, would be enough by itself to guarantee American security, was far-fetched all along. 】.
如果可以完全建立起那样一个保护系统，就能足以保证美国的安全，这样一个想法一直以来是牵强的。
Yet any idea that 【 such a shield, if it can be constructed at all, would be enough by itself to guarantee American security, was far-fetched all along. 】.
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