motorcycle – n. a vehicle with two wheels that is powered by a motor and that can carry one or two people

compression – n. applying pressure to someone's chest in order to help blood flow through the heart in an emergency situation

instinct – n. a natural desire or tendency that makes you want to act in a particular way

cardiopulmonary resuscitation (CPR) – n. a way of trying to save the life of someone who has stopped breathing and whose heart has stopped beating
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