preheating section of kiln

例句：

1. 1.The preheating section of the furnace is crucial for the proper operation of the machine.
   炉子的预热段对于机器的正常运行至关重要。
2. 2. During the preheating section, the temperature gradually increases to ensure a smooth transition.
   在预热段，温度逐渐升高，以确保平稳过渡。
3. 3. The preheating section of the conveyor belt is designed to heat up the material before it is transported.
   输送带的预热段设计用来加热物料，使其在运输前达到适宜的温度。