a hard nut to crack 棘手的问题...hair crack 细裂痕...sand-crack 蹄裂病(马)...macro-crack 宏观裂缝...zigzag crack 不规则裂缝...under bead crack 焊道下裂纹...hair crack(ing) 发裂...quarter crack 马蹄裂...crack n.裂缝,爆裂声vt.(使)爆...quenching crack 淬火裂痕...magnetic crack detection 磁力探伤检...capillary crack 细裂纹...atmospheric crack 风化裂纹...toe-crack 蹄裂病(马)...unstable crack growth 失稳裂纹扩展...immerged crack 深埋裂纹...unstable crack propagation 失稳裂纹扩展...fire-crack 烧裂...crystal crack 结晶裂纹...crack-up n.碰撞,衰弱,神经衰弱,瓦解...underbead crack 焊珠底圻裂...
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