They closed the cracks in the wall with plaster.

他们用石膏把墙上的裂缝填满了。

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A number of thin cracks appeared in the wall.

墙上出现了许多细裂缝。

《牛津词典》

When that wall cracks, there's another underneath.

等那层墙壁裂开之后，下面还会有一层墙。

youdao

"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

Using state-of-the-art surveying equipment, Reeves is expected to begin searching cracks on the northern wall for a secret doorway leading to a previously undiscovered space.

CNN: Search for Nefertiti's burial site given green light

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