sealing of a casting

例句：

1. 1. The engineer sealed the casting to prevent it from corroding.
   工程师密封了铸件以防止腐蚀。
2. 2. During the casting process, the mold is sealed to ensure the quality of the finished product.
   在铸造过程中，模具被密封以确保成品的质量。
3. 3.The sealing process is crucial for maintaining the integrity of the casting.
   密封过程对于保持铸件的完整性至关重要。