scrap preheater

例句：

1. 1. The scrappreheater is used to heat upscrap metal before it is melted down.
   废品预热器用于将废金属加热至熔化前。
2. 2. The scrap preheater helpsto reduce energy consumption and improve efficiency.
   废品预热器有助于减少能源消耗和提高效率。
3. 3. The scrap preheater is anessential tool for recycling industries.
   废品预热器是回收行业不可或缺的工具。