coal seam 煤层
welding seam 焊缝；对接焊缝
weld seam 焊缝
thin seam 薄煤层
welded seam 焊缝；熔接缝
seam welding [化]缝焊
side seam 侧缝；侧骨；摆缝；水平焊缝
longitudinal seam 纵接缝；纵向焊缝；纵向缝
seam line 接缝线；模缝线
seam allowance 止口；子口；缝头
circular seam 环缝
seamed with 用…而留下伤疤；因…而长了皱纹
spiral seam 螺旋缝
gassy seam 瓦斯煤层
词
