你在机场去地铁站直接带着俩娃给他们办最靠谱。还有就是坐火车成人票+儿童票比只买成人票更便宜。 The Young Visitor Discount - for children between 11 & 15 in London less than 15 days The Oyster ID Card required by children between 11 and 15 to get child rate fares on Oyster is for most short-term visitors not a realistic proposition. The cost, hassle and time to process the ID card is just not worth the effort. The Young Visitor Discount scheme has been created as the answer for short-term visitors who have children between 11 and 15. The Young Visitor discount gives half adult rate pay as you go fares on bus, Tube, tram, DLR, London Overground and most National Rail services for up to 14 days and gives your child a daily cap half that of an adult. After 14 days the discount will expire and the Oyster card will charge full adult rate fares. The discount can be set on both regular Oyster Cards and Visitor Oyster cards. Oyster Cards - more details The Young Visitor Discount can only be set onto Oyster Cards and Visitor Oyster Cards at: Any Underground station (including Heathrow Airport). Although there are no longer manned ticket offices at Underground Stations members of staff will be available in the ticket hall with the ticket machines. Just make contact with a member of staff to have the Young Visitor Discount loaded onto the Oyster. Visitor or Travel Information Centres (Gatwick & Heathrow Airports, Liverpool Street, Euston, Paddington and King's Cross Railway Stations and Piccadilly Circus Underground Station) Victoria Station National Railways Ticket office TFL Rail station ticket offices To get the Young Visitor Discount: You and your child must be together at the ticket office when asking for it to be set One adult can get the Young Visitor Discount set for up to four children
伦敦地铁票用contactless卡买特便宜，有foreign transaction fee也花不了多少钱。千万不要用那个机器买纸质的票，会贵很多。 就是有的信用卡不能用，比如discover，我还有一个visa卡虽然是contactless的，但每次都刷不过去。
给孩子一张contactless卡，特别方便，进站出站各刷一次，不用买票太方便了
请问这个是什么？
第一次听说