skyscraper - A very tall building in a big city., public transport - Buses, trains, metro that everyone can use., electric bus - A bus that uses electricity., bike lane - A special road for bicycles., pedestrian zone - An area only for walking, no cars., solar energy - Power that comes from the sun., hologram screen - A screen that shows 3D pictures., low pollution  - When the air is not very dirty., recycling - Using old materials again., energy saving - Using less energy.,

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