fissure round bur

例句：

1. 1. The rock is riddled with fissures that can't be seen from the surface.
   这岩石布满了从表面看不到的裂缝。
2. 2.The crack in the wall was caused by the heavy rain.
   墙上的裂缝是由大雨造成的。
3. 3.The scientist carefully examined the fissures in the rock to determine its age.
   科学家仔细检查了岩石中的裂缝，以确定其年龄。