[N-COUNT 可数名词]鹅卵石;砾石 A pebble is a small, smooth, round stone which is found on beaches and at the bottom of rivers.
Oxford
peb·ble/ˈpebl; NAmEˈpebl/nouna smooth, round stone that is found in or near water 鹅卵石;砾石pebblepebblespebbledpebblingpeb·ble/ˈpebl; NAmEˈpebl/
LDC
pebblepeb‧ble /ˈpebəl/ ●○○ noun [countable]
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pebblea small smooth stone found especially on a beach or on the bottom of a river: The beach was covered with smooth white pebbles.—pebbly adjective: a pebbly beach