（2）现患病例(prevalent case)：人群中业已存在的某病的病人。 （3）死亡病例(death case)：研究中收集暴露史之前已死亡的 病例。
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prevalent case
普遍情况下
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And sometimes, as is the case with the increasingly prevalent mobile supper clubs, you might not even be able to pin down their location.
BBC: Hong Kong��s secret nightlife spots
The Dell case illustrates the perverse short-term view prevalent on Wall Street that dictates that growth must occur continuously, smoothly and linearly every quarter.
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