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  1. overhead projector

    英式

    • n.
      a device that projects an enlarged image of an acetate or other transparency placed on it on to a wall or screen by means of an overhead mirror.
    • noun: overhead projector, plural noun: overhead projectors

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    • IPA[ˈoʊvərˌhɛd prəˈdʒɛktər]

    美式

    • n.
      a device that projects an enlarged image of a transparency placed on it onto a wall or screen ...

    Oxford American Dictionary