offshore – adj. located in a foreign country or territory

two-tier – adj. having two levels or two different groups

barrel – n. the standard measurement of oil

consumers – n. someone who buys good and services

opportunities – n. chances to do or accomplish something

DARPA --​ n. Defense Advanced Research Projects Agency, a U.S. agency that invests in technologies for national security

rapidly – adj. quickly

three-dimensional – adj. having length, width and height


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