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expansion crack
el.	伸缩裂纹
el.mach.	膨胀裂缝纹
hydroel.st.	膨胀裂缝; 伸缩裂缝
met.	膨胀裂纹; 延伸裂纹
nautic., tech.	膨胀裂纹膨胀开裂
tech.	膨胀裂缝; 胀裂; 膨胀伤痕