spelunking /spɪˈlʌŋkɪŋ/ noun Learner's definition of SPELUNKING
[noncount] US
: the sport or practice of exploring or studying caves洞穴探察（运动） -
Her hobbies include hiking, biking, and spelunking.她的爱好有徒步旅行、自行车运动及洞穴探察。
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They love to go spelunking.他们喜欢探察洞穴。
— called also caving