a large, round container, usually made of wood or metal, with flat ends and, usually, curved sides; the amount that such a container holds 桶；一桶的量➡ picture at transport
a unit of measurement in the oil industry equal to between 120 and 159 litres 桶（石油业的计量单位，每桶相当於 120 升到 159 升）◆Oil prices rose to $60 a barrel. 石油价格上升到每桶 60 美元。◆The forecast for global oil demand is 76 m barrels a day. 预测全球石油需求量为每日 7600 万桶。
a unit of measurement used in the beer-making (brewing) industry equal to about 164 litres 桶（啤酒制造业的计量单位，每桶相当於 164 升）