这可能是长达2.5亿年的火山活动间歇所引发的，那意味着更少的二氧化碳被排放到大气中，温室效应也降低了。
This may have been triggered by a 250-million-year lull in volcanic activity, which would have meant less carbon dioxide being pumped into the atmosphere, and a reduced greenhouse effect.
他们可以产生“球阀”效应，引起房室瓣口间歇性关闭。
They can produce a "ball valve" effect by intermittently occluding the atrioventricular valve orifice.
对无回流间歇曝气系统在沉淀期间进水的可行性和进水效应进行了研究。
A study was made of the feasibility and effect of feeding during settlement in non-backflow intermittent aeration system (NBIAS).
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