火山活动具有喷发频率低、间隔时间短、以宁静的溢流式喷发为主间或伴随较强烈的爆发式喷发为特点。
The volcanic activities might be of lower eruption frequency, short interval between volcanic eruption cycles, and relatively quiet eruption, occasionally accompanied by intensive explosive eruption.
方法对采血室消毒前、后，无人活动时，采血进行时进行空气采样和培养，采样时记录间隔时间和人员流动情况。
Method The air samples from blood collection room were collected and cultured before and after air (sterilization), and again before and after various personnel activities.
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