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macrocrack ['mækrəʊkræk, -roʊ-] n
gen. 大裂缝〔隙〕
eng.geol. 宽裂缝
steel. 宏观裂纹
tech. 宏观裂缝; 大裂隙
macrocrack: 1 phrase in 1 subject
Explosives and Explosive Ordnance Disposal1