保持阀瓣处于完全关闭位置也能够避免焊花直接掉在阀座和阀瓣的连接面上。

Leaving the valve in a fully closed position helps prevent weld spatter from falling directly onto the mating faces of the seats.

沿着新的海岸线，我看到施工队伍正在建设海堤。那里有无数的水泥泵车、起重机、大型钢管和闪着焊花的焊枪。

Along the new coastline I can see construction crews building a sea wall. There are cement-pumping trucks, cranes, large steel pipes, and the flash of welding torches.