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所有这些办法都在不同时候尝试过。
all these methods have been tried at different times.
Last Update: 2016-12-04
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16. 李裕伟先生简要回顾了世界上现有的一些资源/储量分类系统，认为所有这些办法都不是 "区域 "资源/储量分类的理想系统。
16. mr. li provided a summary review of a number of existing resource/reserve classification systems from around the world and concluded that all fell short of an ideal system for the resource/reserves of the area.
Last Update: 2016-12-03
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