Fell Onto The Land的意思|示意

降落到地面 The fallout came from hundreds of above-ground nuclear tests in America and other parts of the world. The radioactive isotope Strontium-90, one of the by-products of the bombs, spread into the atmosphere, fell onto the land, was ingested by dairy cows and passed into the milk supply. Strontium-90, like calcium, was concentrated in children's teeth in detectable amounts.