hearth-bottom sand是什么意思

中文翻译炉床底砂

网络释义

1)hearth-bottom sand,炉床底砂2)hearth,炉底，炉床3)Sandy sea bed,砂质底床4)bottom sand,炉底砂5)hearth bottom,炉床底6)fluidized sand bed furnace,流化砂床炉