基本解释[交通运输工程]根部未焊透英汉例句双语例句As backing bar for grooved weld on beam flange exists, artificial crack is formed because of lack of fusion at the root of flange weld.由于梁翼缘的平坡口焊缝垫板结构存在，梁翼缘焊缝根部融合不良而形成“人工” 裂纹。lack of root fusion更多例句专业释义交通运输工程根部未焊透