precooling of aggregate

例句：

1. 1. The equipment needs to be precooled before it can be used.
   设备在使用时需要先进行预冷却。
2. 2. The precooling process is crucial for the quality of the final product.
   预冷却过程对于最终产品的质量至关重要。
3. 3. The precooling treatment helps to reduce the risk of thermal shock on the machine.
   预冷却处理有助于减少机器因热冲击而受损的风险。