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narrow margin, narrowback, narrowband, narrowbase, narrow-beam, narrow-book, narrowcast, narrowcasting, narrow-chested, narrowfisted,

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铌的, 铌钙矿, 铌化物, 铌链铁铀矿, 铌铈钇矿, 铌酸钙, 铌酸钾, 铌酸钠, 铌酸锌, 铌酸盐,