裂纹

例句：

1. 1. The old house has many cracks in the walls.
   这所老房子的墙上有很多裂缝。
2. 2. The glass was cracked when it fell from the shelf.
   玻璃从架子上掉下来时已经裂开了。
3. 3. He noticed a crack in the wall and called for an expert to fix it.
   他注意到墙上有一个裂缝，并叫来专家来修理它。