The bigger problem with the spec is that UnsignedImportMustBeDenied and SignedImportMayBeAccepted don't actually do anything. canImport is defined as P || Q. UnsignedImportMustBeDenied checks that !P && !Q = !canImport. SignedImportMayBeAccepted checks that P = canImport. These are tautologically true! If they do anything at all, it is only checking that canImport was defined correctly.
即使在这样保守的假设下，多次模拟显示防护层仍能保持必要完整性。另项分析表明，即便整块材料脱落，底层复合结构仍可维持乘员舱完好。
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苹果公司将重新定义iPhone 20:57