scalar product，dot product，inner product
product detector product demodulator
the ratio of output of main product to by-product of the crops
contamination from nuclear fallout
fallout
放射性
落尘
跌出物
辐射尘
沈降物
沈降
散落物
下落物
放射性尘降
辐射落尘
落下灰
沉降物
降落
放射性沉降物
辐射微尘
落尘收集器