closed mould

例句：

1. 1. The closed mould was used to make the product.
   这个密封模具被用来制作产品。
2. 2. The closed mould is essential for the production process.
   这个密封模具对于生产过程至关重要。
3. 3. The closed mould can be used to create various shapes and sizes of products.
   这个密封模具可以用来制造各种形状和尺寸的产品。