设计这种导弹的目的在於一旦它发射了,任何举措都不可以重新找回它.
因为once 它后面是一种假设的情况呀,所以就得用fired,虚拟语气来的
这句话它省略了一些东西,完整的句子应该是这样的:this missile is desingned so that once this missile is fired nothing can be done to retrieve it.
this missile is designed so that once fired nothing can be d
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