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pebble (n.)
[pebble 词源字典]
small, smooth stone, late 13c., from Old English
papolstan
"pebblestone," of unknown origin. Perhaps imitative. Some sources compare Latin
papula
"pustule, pimple, swelling."
[pebble etymology, pebble origin, 英语词源]
[pebble 词源字典]