a person with a high level of knowledge or skill - expert, a visit made by students to study something away from their school or college - field trip, a special door that helps you to travel from one place to another in what seems like 5 seconds - portal, the inside surface of a room that you can see when you look above you - ceiling, to appear or happen, especially suddenly or unexpectedly - pop up, a device worn on the back that uses gas or water to push someone into the air, especially an astronaut - jetpack, a special type of image made with a laser in which the objects shown as if they are realflat - hologram, a popular belief that is probably not true - mythology, a vertical structure, often made of stone or brick, that divides or surrounds something - wall, the flat surface of a room on which you walk - floor,

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