名词
中文翻译：故障源
同义词：
['cause of failure', 'root cause']
例句：
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1. The fault source was identifiedas a software bug.
故障源被确定为一个软件错误。
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2. The engineer tracedthe fault source to a loose connection inthe circuitry.
工程师追踪到电路中松动的连接作为故障源。
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3. The investigationrevealed that the fault source was due toa manufacturing defect.
调查发现，故障源是由于制造缺陷造成的。