| A | B |
|---|
| calculate | to work with numbers |
| develop | to grow or change over time |
| exist | to be real or present |
| originate | begin |
| primary | the main or most important thing |
| replace | to take or fill the place of |
| situation | how things are |
| variety | type or kind of something |
| communicate | to exchange information or conversation with other people, using words, signs, writing etc |
| formal | Normal behaviour is very polite, and is used in official or important situations, or with people you do not know well |
| demonstrate | to show or prove something clearly |
| get the hang of | to learn how to do something or use something |
| introductory | said or written at the beginning of a book, speech etc in order to explain what it is about |
| practical | relating to real situations and events rather than ideas, emotions etc |
| similar | almost the same |
| stand for | when a symbol or letter represents a word or idea, especially as a short form |
