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裂隙
lièxì
［crack;crevice;fracture］ 是指表面纤维短期分离，通常是从边缘开始不都延伸通过整个物体厚度，裂开的缝儿 。一般木质、石质、硬质塑料等发生该现象较多。如：木质的裂隙有干裂、轮裂、径裂等表现方式