名詞 fug:

1. (British informal) an airless smoky smelly atmosphere

1. Open the window there's quite a fug in here.
   打開窗戶吧--這里的空氣不新鮮了。

fug

n.（名詞）
A heavy, stale atmosphere, especially the musty air of an overcrowded or poorly ventilated room:
室內(nèi)的悶熱空氣（或氣味）：一種沉悶、不新鮮的氣氛，尤指由于屋內(nèi)人太多或通風(fēng)不好造成的有霉味空氣：
例句：
.In spite of the open windows the stench had become a reeking fug.(Colleen McCullough)
.盡管開著窗但臭氣已經(jīng)彌漫空氣.(科琳·麥卡洛)

來源：
Perhaps alteration of fogo [stench]
可能為 fogo的變化 [惡臭]