短语词组短语bucket t brigade device 组桶式掐;斗链式掐BBD Bucket Brigade Device 消防桶长龙接力式器件;戽链器件;组桶式器件D Bucket brigade device 戽链器件BBD D Bucket Brigade Device 消防桶长龙接力式器件;戽链器件 返回 bucket brigade device