| A | B |
|---|
| electricity | the power that is carried by wires and used in order to provide heat or light, to make machines work, etc. |
| backwards | to move in the direction that is behind you |
| forwards | to move in the direction that is in front of you |
| invent | to create something new |
| direction | the way something is moving or heading |
| crowded | filled with too many people or things |
| pollution | air, water, or soil that is dangerously dirty |
| machine | a piece of equipment that uses power such as electricity to do a particular job |
| device | a machine or other small object that does a particular job |
| invention | something that has been created or designed for the first time |
| patient | a person who needs medical care |
| useful | helpful |
| discuss | to talk about something, usually something important |
| control | to make someone or something do what you want or work in a particular way |
| translate | to change something from one language into another language |
