fluid welding

例句：

1. 1. The fluidityof the material is crucial for its performance.
   这种材料的流动性对其性能至关重要。
2. 2. The engineerused a special fluid to cool the engine.
   工程师使用一种特殊的液体来冷却发动机。
3. 3. Theliquid was clear and transparent, allowing usto see through it easily.
   这种液体清澈透明，让我们能够轻松地透过它看到里面的东西。