levitation – n. making something rise into the air
propulsion – n. the force produced by a system for moving, or propelling, a vehicle
emission – n. the act of producing or sending out something (such as energy or gas) from a source; something that is sent out or produced by something
commercial –adj. concerned with earning money
turbulence – n. an unsteady or violent movement of air or water
infrastructure – n. the basic equipment and structures (such as roads and bridges) that are needed for a country or region
roaring – adj. very load active or strong
