heat intensity of hearth

例句：

1. 1. The heat intensity of the furnace is crucial for the operation of the machine.
   炉火的热强度对于机器的运行至关重要。
2. 2.The engineer measured the heat intensity of the fire to ensure it was within safe limits.
   工程师测量了火焰的热强度，以确保它处于安全范围内。
3. 3. The heat intensity of the fire can vary depending on the type of fuel and the size of the fire.
   火焰的热强度取决于燃料类型和火的大小。