In recent days heatwaves have turned swathes of our country into furnaces.
最近一段时间，热浪来袭，把我们国家的大片地区都变成了火炉。

heatwave 一段天气异常炎热的时期; 酷热期；热浪
swathes of our country = large parts of our country
我们国家的很多地方

furnace 火炉，熔炉
It's like a furnace in here.
这里热得像火炉。
In recent days heatwaves have turned swathes of X into furnaces.
最近一段时间，热浪来袭，某某地方的大片地区都变成了火炉。

It smells like ham trapped behind a radiator.
闻上去就像火腿卡在了暖气片里。

baking used to say that a person or place is very hot.
It's a baking hot morning.
上午太热了！
I'm baking！
我好热啊！

boiling 炽热的，很热的 boiling （very hot）or boiling hot.
It's a boiling hot day.
天气酷热。
I'm boiling.
我太热了！
It's like a sauna.
（热得）像在蒸桑拿。
It's like an oven.
（热得）像在烤箱里烤一样。