Although the origins are uncertain, experts think that this is largely due to the high level of volcanic activity in the area.

尽管起源还不确定，专家认为这主要是由该地区频繁的火山喷发所造成的。

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The additional network workload will be proportional to the increase in disk activity due to cluster replication.

因为集群复制而增加的网络工作负载必须与增加的磁盘活动成比例。

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A decrease in physical activity due to the increasingly sedentary nature of many forms of work, changing modes of transportation, and increasing urbanization.

越来越多的工作形式为久坐的性质、交通方式的变化以及城市化加剧均造成身体活动的减少。

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The cut was due to declining mining activity globally due to softening of metal and iron-ore prices.

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Some breaches result from negligence, inadvertent disclosure, but many are due to malicious activity.

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"What we see today is 100 percent due to human activity, " said Tans, a NOAA senior scientist.

NPR: Greenhouse Gas Milestone; CO2 Levels Set Record