请问伦敦希思罗机场哪儿可以买到Oyster？我在三

you can buy an Oyster card at the airport Tube station. Exit the airport and follow the signs for the Underground. You can purchase an Oyster card at the cashier window.見Buying Oyster Cards at Heathrow Airport：http://www.visitlondon.com/traveller-information/travel-to-london/airport/heathrow

我記得Oyster都要到地鐵站買吧，到Heathrow的地鐵站有櫃台買就好了，第一、第二和第三航站都是在同一個地鐵站，然後可以直接搭乘地鐵到市區

the tube station ticket office.
Or perhaps sometimes the shops in the airport. Just ask a staff member.

跟着标识走 看到地铁站就有卖啊

晚上卖票到几点啊？我到伦敦比较晚？谢先！