什么是forced air heater和convection heater?有什么不一样,他们的中文译名是什么?

什么是forced air heater和convection heater?有什么不一样,他们的中文译名是什么? heater forced forced 英语翻译整句话是：Motor rotary pump,for regenerative air heater flushing for 3% caustic soda, 英语翻译refractory desigF.A.ductfluidizing nozzletrim piping and valveMCCDCSPA/SA/ID fangas air heater steam air heaterlimestone pneumatic transfer systemlimestone feed systemsand feed systemstart-up burnerSNCR systemstack & structure Without air,we should be forced to seek shelter from the sun...Without air,we should be forced to seek shelter from the sun,as there would be no atmosphere to protect us from the sun's deadly rays.为什么用should be forced而不用would be forced, What does a paper boy do what does a tour guide do what is a heater used for?what is an air conditioner used for? 英语翻译含义?另外,有没熟悉世界各地习惯的,例如某些国家夏天用空调,叫air conditioner,而冬天用heater electric heater,electrical heater?哪个对? 英语翻译When the heater was some distance above the floor and there was no air change in the room ,there was practically no convectional motion below the heater ,where the air temperature remained constant- On the other hand,above this level,a co heater什么意思 flashlight ,electric heater induction heater是什么意思 heater bank什么意思 vamironing heater是什么意思 electric heater是什么意思 forced是什么意思