furnace throat

例句：

1. 1. The furnace throat is the narrowest part of the furnace where the hot gases are forced to flow through.
   炉口是炉子最窄的部分，热气流被迫通过。
2. 2. The engineer carefully inspected the furnace throat for any signs of wear or damage.
   工程师仔细检查了炉口，寻找任何磨损或损坏的迹象。
3. 3. During the maintenance, the technicians had to clean and replace the furnace throat to ensure proper functioning.
   在维护期间，技术人员必须清洁并更换炉口，以确保正常运行。