摘要
Petrologists^1-experts in the study of mineral-bearing rocks-have for some time now held the believe that deep down beneaththe Sahara^2 there lay enormous untapped sources of oil,minerals,and natural gas.After months,even years,of surveying,chartingand analysing various possible sites in the desert,the order was giv-en to haul drill-rigs^3 to some of the sites and put the theories to thetest.
出处
《语言教育》
1996年第9期41-42,共2页
Language Education
