单词	free diving
释义	free diving noun variants or free-diving : the sport of diving and swimming beneath the surface of water especially to considerable depth without a portable breathing device and typically with a face mask and one or two flippers That's the essence of free diving, a sport defined by lung capacity and physical endurance. Taken broadly, "free diving" encompasses everything from floating face down in a swimming pool … to plunging more than 500 feet on a weighted sled … . Logan Ward called also skin diving Word History First Known Use 1948, in the meaning defined above
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