preheater

例句：

1. 1. The oven needs to be preheated before cooking the meat.
   在烹饪肉类之前，烤箱需要预热。
2. 2. The preheater is essential for ensuring the equipment starts smoothly.
   预热器对于确保设备顺利启动至关重要。
3. 3. The engineer tested the preheater to ensure it would not fail during operation.
   工程师测试预热器以确保在操作过程中不会失败。