增量2项目是美军有史以来规模最大的研发工作，以增加B - 2武器系统杀伤力。
Increment 2 is the largest effort ever undertaken to augment the lethality of the B-2 weapon system.
拨慢了核时钟最大的单一因素就是超级工厂病毒，这有史以来最具杀伤力的网络武器。
The biggest single factor in putting time on the nuclear clock appears to be Stuxnet, the most sophisticated cyberweapon ever deployed.
但最大的风险来自手机，因为有研究表明，这些玩意儿个头虽小，在分散司机的注意力上却往往具有更大的杀伤力。
But mobile phones pose the biggest risk, for research shows that these gadgets distract in a more pernicious way.
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