Deaths in jobs related to oil and gas extraction jumped from 72 victims in 2002 to 125 in 2006, a 70 percent increase.
石气开采相关工作岗位死亡人数由2002年的72人增加到了2006年的125人，增幅多大70%。
2
Mining of copper, cobalt, diamonds, gold, zinc and other metals, as well as petroleum extraction, once accounted for 75 percent of its GDP.
铜、钴、钻石、黄金、锌和其它资源的开采，以及石油开采，曾经占其GDP的75%。
3
Liquid-Liquid Extraction (LLE) is a kind of tradition sample pretreatment method. There are 70 percent of documents which adopt Liquid-Liquid Extraction as a way of sample pretreatment.