Traditional Culture Encyclopedia - Hotel accommodation - What kind of card is a card?

What kind of card is a card?

Cards can be business cards, mobile phone cards, hotel room cards, bus cards, postcards, greeting cards, etc. In English, it means playing cards, postcards, cards, programs and so on. It is also an abbreviation, which means that the number of elements in a set is a very high number.

Life common sense refers to the scientific knowledge summarized by people in daily life, which can be divided into physics, biology, chemistry, medicine, first aid knowledge, geography, safety, cosmic celestial bodies, natural phenomena and other common sense contents.