放射性沾染物fàng shè xìng zhān rǎn wùfangshexingzhanranwuradioactive contaminantCharacters in this word射to shoot, to eject, to emit性sex, nature, character放to release, to liberate, to free染dye沾to moisten, to soak, to wet物thing, substance, matterStudy it in Yanamino