高温熔炉里的金属正在被倾倒。
The metal is being poured from a ___furnace.
冬天我们依靠家里的暖气来取暖。
In winter, we rely on the ___furnaces at home for heating.
冬天来临时，我们打开了暖气。
We turned on the ___furnace when winter arrived.
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