双管炮

double-barreled───双管散弹枪

double cele；ation───双重庆祝

double-barrelled───双管

double fertilization───[植]双受精（作用）

double refraction───[光]双折射

double bassoon───倍低音管

double bedroom───可容双人床卧室

• double-barreled cannon
• double-barreled pistol