moulding gravel

例句：

1. 1.The engineer used a moulding machine to shape the concrete into blocks.
   工程师使用模具机将混凝土塑形成块。
2. 2.The moulding process is crucial for producing high-quality products.
   模具加工过程对于生产高质量产品至关重要。
3. 3. The mould is made of stainless steel, which ensures the product's quality and durability.
   模具由不锈钢制成，这保证了产品的质量和耐用性。