... downward spiral向下旋转;螺旋式下跌;减记恶性循环 downward movement向下运动 downward welding平焊,俯焊 ...
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vertical downward welding 向下立焊
vertical-downward welding 从上到下立焊
downward welding technique 下向焊技术
Welding vertically downward 垂直的从上往下焊
welding upward and downward 向下向上焊
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