pebble基本解释
n,[建]卵石；水晶透镜,同近
As the last Ice Age came to an end, somebody picked a pebble out of a small river not far from Bethlehem..随着最后一个冰河时代宣告结束，有人从伯利恒附近流水淙淙的小溪边，捡起了一枚鹅卵石。
小圆石,小鹅卵石中释n
pebble bed,卵石层，卵石床.短语
