draught在美式英语中写作draft。

on draught
从桶里汲取的available from a barrel
The pub has several good beers on draft.这小酒店有几种挺不错的散装啤酒。

There is a draught in this room.这房间里有风。
He emptied his glass at one draught.他将杯中物一饮而尽。
He took a deep draught of air into his lungs.他深深地吸了一口气。