It should be noted that because of the voluntary nature of the reporting system, there might be some under-reporting of cases.
应当指出，由于报告系统的自愿性质，可能有一些病例没有被记录。
It should be noted that because of the voluntary nature of the reporting system, there might be some under-reporting of cases.
应当指出，由于报告系统的自愿性质，可能有一些病例没有被记录。
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