virtual reality (VR), Computer-made world you can see and hear., headset, Glasses with a screen to see 3D worlds., painkillers, A medicine that makes pain go away., experiment, A study or test to learn something new., reduce, To make something smaller or less., effect, Something that happens because of an action., patient, A person who is sick and needs medical care., hospital, A building where sick people are treated., researcher, A person who studies something carefully., nature, The world outside: trees, rivers, mountains..

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