order a round (expression) - to buy drinks for a group of people. We can also say 'buy a round'. It is very common for friends or a group of people to take turns to buy drinks in a pub.
persistence (n.) – not giving up, continue to do something in a determined way. 坚持,执着,执意
His persistence was finally rewarded when the insurance company agreed to pay for the damage.
保险公司同意赔偿损失,他的坚持不懈终于得到了回报.
lager (n.) – it is a type of beer which is pale in colour and the favour of which is usually mild. 拉格啤酒,储藏啤酒
pint (n.) – the measurement of liquid, a pint is about half a litre. 品脱
bitter (n.) – (UK) refers to a type of dark brown beer which has a bitter taste. 苦啤酒