These oxides are released into the atmosphere and they can fall back to earth as acid rain.

这些氧化物会被排进大气，然后会以酸雨的形式降回地面。

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They later fall to the Earth as acid rain, sometimes hundreds of kilometers from where they were formed.

它们以酸雨的形式降到地球上，有时离酸雨形成的地区有千里之遥。

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Europium and terbium rare earth complexes with tetra carboxylic acid were successfully prepared in aqueous solution.

摘要在水溶液中合成了铕和试的四元羧酸稀土配合物。

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Since no dinosaur fossils have ever been found in sediments dating from after this point, conventional wisdom has it that the largest creatures ever to roam the earth must have been cut down in their prime - victims of an asteroid impact that sparked firestorms, acid rain and a nuclear winter that blotted out the sun.

BBC: Closing the 'three metre gap'