a furnace
furnace 是可数名词，泛指单数时前面用 a 或 an。
The old house still has a coal furnace in the basement.
那栋老房子的地下室里还留着一台燃煤炉。
磨难；考验；磨炼；工业加热设备,如用于冶炼金属或烧制陶瓷。；一个封闭的腔室,用于产生热量以加热建筑物、销毁垃圾、冶炼或精炼矿石等；惩罚、痛苦或重大考验的场所或时期；严酷的经历或磨练。；火炉
An industrial heating device or enclosed chamber used for smelting metal, firing ceramics, heating buildings, or burning refuse.
工业加热设备,如用于冶炼金属或烧制陶瓷。
An industrial heating device, such as for smelting metal or firing ceramics.
一个封闭的腔室,用于产生热量以加热建筑物、销毁垃圾、冶炼或精炼矿石等
an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.
惩罚、痛苦或重大考验的场所或时期；严酷的经历或磨练。
A place or time of punishment, affliction, or great trial; severe experience or discipline.
The furnace in the basement keeps the whole house warm during winter.
地下室的暖气炉让整个房子在冬天保持温暖。
用法提示：furnace 是名词，指供暖用加热炉，在句中作主语。
Before the winter arrived, we had a technician check the furnace.
冬天来临之前，我们请技术人员检查了暖气炉。
用法提示：furnace 是名词，作 check 的宾语，指家用的供暖炉。
The factory's furnace melts scrap metal at a very high temperature.
工厂的熔炉在高温下熔化废金属。
用法提示：furnace 是名词，指工业用熔炉，在句中作主语。
furnace 是可数名词，泛指单数时前面用 a 或 an。
The old house still has a coal furnace in the basement.
那栋老房子的地下室里还留着一台燃煤炉。
复数 furnaces 泛指多台炉子，具体数量前可加数词。
Two furnaces ran all night to melt the scrap metal.
两台炉子整夜运转，用来熔化废金属。
表示在炉内加热时，常用介词 in a furnace 或 into a furnace。
The ore is heated in a furnace until it melts.
矿石在炉中加热，直到熔化。
the furnace of... 是比喻用法，指严酷的考验或磨炼。
He was hardened in the furnace of war.
他在战争的熔炉中变得坚强。
grammar · medium
易错句子The old factory still has three big furnace.
正确表达The old factory still has three big furnaces.
furnace 是可数名词，前面有 three 这类大于一的数词时，必须用复数形式 furnaces。汉语名词不随数量变化，学习者常忘记加复数词尾 -s。
grammar · medium
易错句子She put the bread into the furnace to bake it.
正确表达She put the bread into the oven to bake it.
furnace 指工业用的加热炉、熔炉；家用烤食物的电器是 oven。汉语里两者都可能说成“炉子”，学习者容易把 furnace 误用到厨房烘焙的语境中。
grammar · medium
易错句子The workers melted the scrap iron on the furnace.
正确表达The workers melted the scrap iron in the furnace.
furnace 是封闭腔体，金属在炉膛内部被熔化，所以要用介词 in。汉语“在炉子上”对应 on the stove，学习者受此影响容易误用 on。
高炉；鼓风炉
The steel mill's blast furnace runs day and night.
这家钢厂的高炉昼夜不停地运转。
电炉
They melted the scrap metal in an electric furnace.
他们用电炉熔化了废金属。
燃气炉；燃气暖炉
Our gas furnace keeps the house warm all winter.
我们的燃气暖炉让房子整个冬天都很暖和。
燃油炉；燃油暖炉
Many older homes here still heat with an oil furnace.
这里许多老房子仍然用燃油炉取暖。
工业炉；工业加热炉
Industrial furnaces consume huge amounts of energy.
工业炉消耗大量能源。
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Dictionary facts from ECDICT, WIKTIONARY.
锅炉房；炉子间
The furnace room in the basement is full of old pipes.
地下室的锅炉房里满是旧管道。