7、sile/n.腋(窝) B bacillus/ba'silas/n.芽孢杆菌backache/'baekeik/n.背痛bacterial/baek'tieriel/a.细菌的bactericidal/baek'tiarisaidal/a.杀菌的bacteriology/baek,tieri'olad3i/n.细菌学的bacterium/baek'tieriem/n.细菌bandagel'baendid3/n.绷带barbiturate/ba:'bitluarit/n.巴比妥盐BCG卡介苗bellyache/’belieik/n.腹