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