| A | B |
|---|
| invent | to think up, to create or produce for the first time |
| inventor | a person who invents something |
| invention | an original device or process |
| problem | something to be worked out or solved |
| simple | easy to understand or perform |
| solve | to find a solution for |
| easy | not hard to do or get : not difficult |
| spring | the act or an instance of leaping up or forward |
| fastened | to attach or join by or as if by pinning, tying, or nailing |
| different | not of the same kind |
| idea | something imagined or pictured in the mind |
| accident | an event occurring by chance or from unknown causes |
