Ramin Skibba/Undark

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Secretary of Defense Lloyd J. Austin III delivers remarks at the U.S. Air Force B-21 Raider unveiling ceremony in December 2022.
军事

作者：Ramin Skibba/Undark

Electric vehicle plugged into a charging station
化石燃料

作者：Ramin Skibba/Undark

A small monkey looking surprised
心理学

作者：Ramin Skibba/Undark

Three rocket parts and an American flag housed at the Kennedy Space Center in Florida.
军事

作者：Ramin Skibba/Undark

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