weakening of moulding sand

例句：

1. 1.The molding process is crucial for thefinal product's quality.
   模具成型过程对于最终产品的质量至关重要。
2. 2. Theweak spot in the designled to a weakening ofthe structure.
   设计中的弱点导致结构弱化。
3. 3. The engineer carefully monitored the strength ofthe moulding sand during the castingprocess.
   工程师在铸造过程中仔细监测了模具砂的强度。