a life jacket or similar device that is designed to help you float in water (the abbreviation for ‘personal flotation device’) 旨在帮助您在水中漂浮的救生衣或类似设备(“个人漂浮设备”的缩写) All competitors are required to wear PFDs and helmets. 要求所有参赛选手佩戴PFDs和头盔。
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