Once dispersed in the environment, it says, cesium-137 “is impossible to avoid.
该结构说，一旦在环境中扩散，铯-137“就是无法避免的。”
Once dispersed , the oil can then be broken down more easily by bacteria that have evolved to live off natural sources of hydrocarbons.
一旦被（化学）分散，随后浮油就更容易被进化到以碳氢化合物等天然污染源为食的细菌降解。
Of course, once the final whistle has blown and the television crews have dispersed, the pitches will need to be resown at great expense with grass fit for South African conditions.
当然，一旦终场哨声吹响，电视机前的观众散去的时候，还得花费高昂的费用在球场上重新播种更适合南非本土条件的草地。
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