基本解释水蒸气保护焊英汉例句双语例句Using the heat of welding to vapour water, cooling rates are lowered on the weld bead and heat -affected zone.利用焊接时的加热使水汽化，不仅使焊道而且使热影响区的冷却速度减慢。water-vapour welding更多例句