短语词组短語Fall -out ratio 誤檢率downwind fall -out 順風落塵tropospheric fall -out 對流層沉降upwind fall -out 上風落塵global fall -out 全球性散落local fall -out 區域落塵cloth fall -out 坯佈脫套fall -out sediment 可沉降物radioactive fallout 放射性塵降物 返回 fall-out