casting sealer

例句：

1. 1. The casting was made from a mixture of metal and sand.
   铸件是由金属和沙的混合物制成的。
2. 2. The casting had to be removed from the mold before it could be inspected.
   铸件必须在模具中取出后才能进行检查。
3. 3. Casting sealers are used to prevent air bubbles from forming in the molten metal.
   铸造密封剂用于防止熔融金属中形成气泡。