背景：新战士在新兵训练期间出现腰椎椎弓峡部断裂发病率较高并影响了正常训练。
BACKGROUND: the incidence rate of spondylolysis of lumbar vertebral arch in recruits is higher during the training, and it affects the normal training.
某电厂锅炉送风机，多次发生叶片断裂事故，严重影响了电厂生产的正常运行。
The forced draft fans of a certain power station suffered repeated failures because of blade ruptures, seriously disrupting the normal operation of the power station.
化学反应器不仅要满足强度条件，以保证在使用中不发生断裂破坏；也要保证刚度条件，使设备在正常操作时的弯曲变形不超过规定的许可范围。
Reactors used in chemical industry must satisfy rigidity requirements to ensure the bending distortion to be controlled within the tolerated range as well as strength requirements to prevent breakage.
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