She bent down to shake a pebble out of her shoe.
她弯下腰,把鞋里的一粒石子抖出来。
He was used to throwing each pebble into the sea as soon as he picked it up.
他习惯了一捡起鹅卵石就把它扔进海里。
The bulk of the ruby rubbish on the pebble bubbles when stirred by bulbed rubber club.
小卵石上的大部分红宝石废料在用有球状突起的橡胶短棍搅动时起泡。