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and had recognized that a large plane full of jet fuel would be an even simpler and more likely weapon than one laden with explosives. Imagine also that someone had recognized that this threat could be substantially reduced by greater security on large commercial planes, and greater oversight of...
四维空间(The four dimensional space).doc,四维空间(The four dimensional space) Assumptions about four dimensions and time tunnels In some science fiction, there is often a fiction about the time tunnel. However, some scholars explanation of the myster