snorkelling       
noun [ U ] UK (US usually snorkeling) uk/ˈsnɔː.kəl.ɪŋ/ us/ˈsnɔːr.kəl.ɪŋ/
 (用水下呼吸管)潜游
the activity of swimming while using a snorkel
  We went snorkelling along the Great Barrier Reef. 我们沿着大堡礁潜游。 
 
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