A number of thin cracks appeared in the wall.

墙上出现了许多细裂缝。

《牛津词典》

Parallel linear cracks are also observed along the crater wall over the gullies, which could be due to thermal contraction of ice-rich material.

在陨石坑口壁上也发现了并行线一样的裂缝，这可能是由于含冰物质热收缩现象造成的。

youdao

After the prayer, Mr. Obama walked a final few paces to the Wall and followed the custom of placing a personal prayer between the stone cracks, with his note left alongside hundreds of others.

祈祷过后，奥巴马按照当地风俗在墙缝中塞进写有个人愿望的纸条，连同他的纸条在内，墙缝中塞满同样写满愿望的纸条。

youdao

Cracks are appearing in the wall of silence surrounding the secret practice of extraordinary rendition as prisoners are coming forward to tell of their ordeals.

VOA: standard.2009.03.21

"Most of the ones I looked at had just cracks in the wall--of no structural significance, " he says.

CNN: ASIANOW - TIME Asia | Taiwan: The Day the Earth Moved--Page 3

Even when there is no earthquake, it's impossible for me to live in a room with so many cracks on the wall and one side of the ceiling dropped.

WSJ: Rescuers Work to Reach Quake Area

Deep cracks beneath the waterline led to parts of the 80-year-old harbour wall collapsing in 2012.

BBC: Weymouth harbour wall: Warning over repair noise