concrete cracks

例句：

1. 1. The concrete cracks in the wall are a sign of aging.
   墙上的混凝土裂缝是老化的标志。
2. 2.The construction workers were worried about the concrete cracks in the foundation.
   建筑工人担心地基上的混凝土裂缝。
3. 3. The engineer inspected the concrete cracks in the bridge to ensure its safety.
   工程师检查了桥梁上的混凝土裂缝以确保其安全。