| A | B |
|---|
| invention | the thing that is invented |
| invent | to make, design, or produce something for the first time |
| inventor | someone who has invented something |
| mystery | something that is difficult to explain or understand |
| obvious | easy to notice or understand |
| habit | something that you do regularly, and usually without thinking |
| label | to write information on something (like a poster) |
| appreciation | something you say or do to thank someone or show you are grateful |
| beneficial | good or useful |
| practical | designed to be useful, or to be suitable for a particular purpose |
| popular | liked by a lot of people, or by most of the people in a group |
| unusual | different from what is usual or ordinary |
