Yī kǎ tōng一卡通a contactless smart card for public transport and other servicesHSK 7+ · 词频 3.0含义all-in-one smart card例句学生凭一卡通进出图书馆。这张一卡通可以坐公交和地铁。校园里吃饭购物都用一卡通。