单词：crack propagation
crack propagation的用法和样例：
例句
- Grain size had some effect on the rate of crack propagation.晶粒尺寸大小对裂纹扩展速率也有影响。
- The fatigue crack growth experiments were performed according to the phenomena that crack occurred at PMMA in use.根据外场使用中出现的裂纹现象，进行了疲劳裂纹扩展试验。
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