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crack up ['kræk'ʌp]
inf. 撞毁〔坏〕; 衰退; 垮掉; 失去控制; 大笑不止
skydive. 撞击; 撞毁; 撞坏
crack-up ['krækʌp]
avia. 飞机摔毁
avia., inf. 失事毁机
busin. 失去控制; 搞垮
crack up
: 3 phrases in 2 subjects
Metallurgy1
Technology2