最有危险性的颗粒是最小的，它们直径为一米的百万分之2.5或更少(简称PM 2.5)。
The most hazardous particles are the tiniest, those with a diameter of 2.5 millionths of a meter or less (called PM2.5 for short).
当然，在旁普罗纳的圣佛明节中，最有意思的就是对危险和死亡的关注。
Surely the most interesting part of Pamplona's San Fermin Festival is its focus on danger and death.
拯救热带雨林是对付全球变暖的最有效的办法之一，而且也有助于保护一些地球上处境最危险的物种和生态系统。
Saving rainforests is one of the most effective ways to fight global warming, as well as helping to preserve some of the Earth's most imperilled species and ecosystems.
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