fissure of nipple

例句：

1. 1. The rock is riddled withfissures that can be dangerousto climb.
   这块岩石布满了裂缝，攀爬时可能会很危险。
2. 2. The oldtree has many fissures thatneed to be filled in before it canbe used again.
   这棵老树有很多裂缝，需要填平才能再次使用。
3. 3.The crack in the wall was caused bya sudden shift in the foundation.
   墙上的裂缝是由于地基突然移动造成的。