单词	spelunking
释义	spelunkingspe‧lunk‧ing /spəˈlʌŋkɪŋ/ noun [uncountable] American English Word Origin WORD ORIGINspelunking Origin: 1900-2000 Latin spelunca ‘cave’, from Greek spelynx the sport of walking and climbing in caves—spelunker noun [countable]
随便看	backbench backbencher backbenches backbiting backboard backbone back boobs backbreaking back-burner back catalogue backchat backcloth backcomb back country backdate backdoor back door backdrop back-end backer backfire back formation backgammon background backhand

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