pratal

例句：

1. 3. 卵形物例句：1. The beach was littered with small pebbles and smooth stones.
   海滩上散布着小卵石和光滑的石头。
2. 2. The old lady placed a small pebble on the edge of her desk.
   那位老妇人在桌子边缘放了一个小卵石。
3. 3. The little boy picked up a small stone and threw it into the water.
   小男孩捡起一块小石头，扔进了水里。