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Biofuel groups envision ethanol-powered jets. But fueling the effort has not been easy
Bastillepost· 18 小時前Some day, the passenger jets that soar 35,000 feet (10.6 kilometers) over Dan McLean’s North ...
US double standards undermine its moral integrity
China Daily· 10 小時前Americans like to think of their country as a world leader, a beacon of democracy and a model for other countries to emulate ...