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3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.
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"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.
Officially, Venezuela has 300 billion barrels of oil reserves – yet in 2023, it exported just 211.6 million barrels of oil, worth about $4bn. Compare that to second-placed Saudi Arabia, which has 267 billion barrels of reserves, but had exports worth $181bn in the same time period.，这一点在WPS官方版本下载中也有详细论述