SIPRI counts the deliveries of large conventional weapons, each of which is assigned a value according to cost, strategic importance and other criteria.

SIPRI统计的是大型传统武器的交付量，每件武器都根据价格、战略重要性和其它标准被赋予一个值。

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The document will say "there remains a narrow range of contingencies in which the option of using nuclear weapons can play a role in deterring large-scale conventional, chemical or biological attack, " he said.

WSJ: U.S. Keeps First-Strike Nuclear Strategy