In the United States, the Smithsonian Astrophysical Observatory and the Mount Wilson Observatory observed a decrease in atmospheric transparency that lasted for several months. 在美國，史密夫寧天體物理學(xué)的觀(guān)測站同威爾遜山觀(guān)測站觀(guān)察查出，最后幾個(gè)月，大氣透明度持續減退。
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