The volcanic eruption is one of the natural hazards. Volcanic eruption not only endangers human being but also induce some secondary or longterm hazards.
一方面，火山喷发是一种自然灾害，它不仅对人类产生直接危害，而且还会诱发次生灾害或对人类的生存环境造成长期的危害。
Abstract: Eight cases of oral syphilitic eruption in secondary syphilis are reported.
文摘：报告8例口腔二期梅毒疹患者。
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