Patients with DN are not presented with typical clinical manifestations at the early stage, making it difficult for early diagnosis.
DN早期常缺乏特异的临床表现，早期诊断有一定困难。
Fault diagnosis is a complex and difficult problem that concerns effective decision-making.
故障诊断是与有效决策密切相关的复杂问题。
Fault diagnosis is a complex and difficult problem that concerns effective decision-making.
故障诊断是与有效决策密切相关的复杂问题。
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