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The US planted 220 million trees in the 1930s to fight Dust Bowl erosion, and many still protect farms decades later | World News Edit Profile Following Sign out Get App
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美国在20世纪30年代种植了2.2亿棵树以对抗沙尘暴侵蚀，许多树在几十年后仍在保护农场The US planted 220 million trees in the 1930s to fight Dust Bowl erosion, and many still protect farms decades later
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