ovicyst

例句：

1. 1.The riverbed is covered with a layer of smooth, ovicite-like stones.
   河床覆盖着一层光滑、卵石状的石头。
2. 2. The ancient city was built on top of a large ovicite formation.
   这个古老的城市建立在一个巨大的卵石构造物之上。
3. 3. The ovicite in the garden has been carefully placed to create a natural path.
   花园中的卵石被小心地放置，以创造一条自然的路径。