Cách sử dụng
The word 'pyramid' is used to describe a very old and big structure that looks like a triangle standing on its pointy end. Pyramids were built a long time ago in Egypt and were used as tombs for pharaohs (kings). They were also used for different religious ceremonies. Nowadays, the word 'pyramid' can be used to describe anything that looks like a triangle with a flat base and is bigger at the bottom than at the top. Some examples include a pyramid of apples, a pyramid of cards, or even a pyramid scheme in business.