hairline crack
美 [ˈherlaɪn kræk]英 [ˈheəlaɪn kræk]
- n.【参见】hair check

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There 's a hairline crack in the rim of that jar
那只罐子的口沿有条极细的裂缝。
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Basing on the above tests , we think that the hairline crack is induced by the remained deep vibration mark of casting slab .
认为,发裂缺陷是板坯连铸时产生的较深沟形振痕残余造成的。
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He seemed to be catching on nothing : propping his boot on a pimple , gripping a " smear " or a hairline crack , freeing both arms from the rock to make a lunge .
他似乎并没有什么可靠的支撑点:踩的地方只是一个小突起;抓的地方只是一块粗糙平面或是一条狭细的裂缝;身子向前猛扑时,双手会脱离岩壁在空中。