B1 [ C ] a small, rectangular piece of card or plastic, often with your signature, photograph, or other information proving who you are, that allows you to do something, such as make a payment, get money from a bank, or enter a particular place（显示个人信息的）卡片；银行卡；通行证

A2 [ C ] also playing card one of a set of 52 small rectangular pieces of stiff paper each with a number and one of four signs printed on it, used in games纸牌

A2 [ C ] a rectangular piece of stiff paper, folded in half, with a picture on the front and often a message printed inside, sent on a special occasion贺卡

[ C ] a postcard 明信片

B1 [ C ] a small, rectangular piece of stiff paper with information printed on it, especially a person's job title, business address, and phone number名片

[ C or U ] (a piece of) thick stiff paper（一张）厚纸片，卡纸

B1 [ C ] a thin plate inside a computer that contains very small electronic circuits and controls certain operations of the computer（计算机的）卡，插件

[ C ] old-fashioned informal a funny or strange person活宝；怪人

to ask someone to show you a document, especially an identity card, in order to prove how old they are要求出示身份证件（以确认年龄）