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  1. crash helmet

    • IPA[ˈkraSH ˈˌhelmət]

    美式

    • n.
      a helmet worn by a motorcyclist or a race car driver to protect the head in case of a crash.
    • noun: crash helmet, plural noun: crash helmets

    • 更多解釋

    英式

    • n.
      a helmet worn by a motorcyclist to protect the head in case of a crash.

    Oxford Dictionary

  2. 知識+