在实物保险箱及号码锁的安全措施之下，盗贼将需要近乎无限的耐心以及近乎无限的预期寿命，才能将各种排列组合的可能性从头到尾尝试一遍。
With a physical safe and a combination lock, the thieves would need nearly infinite patience and a nearly infinite life expectancy to work their way through the possibilities.
动态储备包括若干方面的动态要素，例如：储备粮总规模、库存形态(储备粮实物库存与现金库存的组合)、品种结构或时空布局等。
Dynamic reserve includes several changing factors, such as general scale of grain reserve, stock pattern (combination of physical stock and cash stock), variety structure and space-time layout.
第二部分是组合实物期权评估方法的研究。
The second part offers the method on compound real-options evaluating.
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