hole
crevice
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pore
pores
For pores on the skin, 毛孔 is more common.
墙 上 有 很多 小 孔隙。
There are many small pores on the wall.
这 种 材料 没有 孔隙。
This material has no pores.
水 从 孔隙 渗透 到 地下。
Water seeps through the pores into the ground.