Hair crack
... agent 浸染剂 Hair crack 发缝 Halite 岩盐 ...
Capillary crack
NDT ... Capillary action 毛细(管)作用 Capillary crack 发(状裂)缝,毛细裂纹 Capillary depression 毛细下降 ...
地质 fissure eruption
hair crack ; feather crack ; hairline crack
hair slit comb