fug

n (usu sing 通常作单数); (infml 口) warm stuffy atmosphere, eg in a small or crowded room 热而污浊的空气（如在狭小的或拥挤的房间里）: Open the window there's quite a fug in here. 打开窗户吧--这里的空气不新鲜了.

frustrate, frustrated, frustrating, frustration, fry, fry-up, fryer (also frier), frying-pan, frying-pan (US fry-pan), FT, fuchsia, fuck, fuck-all, fuck-up, fucker, fucking, fuddle, fuddy-duddy, fudge, fuel, fuggy, fugitive, fugue, fulcrum, fulfil, fulfil (US fulfill), fulfill, fulfilled, fulfillment, fulfilment, full, full back, full beard, full board, full house, full marks, full moon, full page, full stop (also full point, US period), full time,