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Strongly poisonous substances

statutory subclass of poisonous substances as defined by Soviet and Russian regulations

Pronunciation
/ˈstrɒŋli ˈpɔɪzənəs ˈsʌbstənsɪz/
/ˈstrɔŋli ˈpɔɪzənəs ˈsʌbstənsəz/