under bead crack

例句：

1. 1.The old house had several under bead cracks in the walls.
   这所老房子的墙上有几处裂缝。
2. 2. He noticed that there was an under bead crack in the floorboards.
   他注意到地板上有一处裂缝。
3. 3.Repairing the under bead cracks in the roof is essential to prevent further damage.
   修复屋顶上的裂缝是防止进一步损坏所必需的。