When debugging a rare mode of failure, never attempt a direct fix.
调试罕见模式的错误时，别企图直接修复。
Use typed exceptions to indicate the mode of failure, and except that type of exception in the test.
用定义好的异常去表达模式的失败， 当然要排除测试中的异常类型。
Fastener common failure mode of failure of the assembly has elongated, fatigue fracture and delayed fracture.
紧固件失效的常见失效形式有装配拉长、疲劳断裂和延迟断裂。
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