fallout radioactive material

基本解释

refrain from harvesting after radioactive material fallout.
有放射性物質落下時不要進行採收。
Unless a large explosion sends radioactive material high into the atmosphere, most of the fallout from Japan will not make it across the Pacific Ocean.
除非發生了大爆炸，將放射性物質送入高層大氣，否則日本産生的放射塵是不會越過太平洋的。
This is highly pertinent. The wind direction, should there be a plume containing radioactive material, determines whether fallout will land on populated areas or in the sea.
這是一個關鍵問題，如果含有放射物質的雲團出現，那麽風曏將決定這些放射性墜塵會降落在聚居地還是海洋。