atypical case

例句：

1. 1. The patient's symptoms were atypical of COVID-19.
   患者的病症与COVID-19不符。
2. 2.The researcher found the results to be atypical in their interpretation.
   研究者发现结果在他们的解释中是不典型的。
3. 3. This mutation is atypical of the virus's usual behavior.
   这种突变是病毒通常行为的非典型表现。