Note：PPM means part per million, usually a measure of quality.
注：PPM是百万分之一件的缩写，通常是质量的一种指标。
It's reasonably priced at $2 per million pages crawled and 3 cents per CPU hour.
而它的价格很合理，每爬行100万个页面只要2美元，每片CPU每小时只收3分钱。
Want concentration of CO2 in atmosphere lowered from 380 to 350 parts per million.
希望将大气中二氧化碳含量由百万分之380降低到百万分之350。
The level of carbon dioxide in the atmosphere is measured in parts per million (PPM).
大气层里二氧化碳含量的测量单位是ppm，即一百万体积的空气中所含二氧化碳的体积数。
A normal amount of CO in your blood is extremely low — zero to eight parts per million.
血液中CO普通含量相当低——零至百万分之八。
To put that in perspective, the current level of CO2 in the atmosphere is 387 parts per million.
总的看来，现在的大气中二氧化碳含量为万分之三点八七。
In the past decade, the fatal accident rate for airlines hasn't been higher than 0.6 per million flights.
过去10年以来，客机致命事故一直没有超过每百万架次0.6的失事比率。
These levels are comparable to the 500 to 1000 parts per million of water in the Earth's upper mantle.
这一水分含量堪比地球的上层地幔500到1000ppm的水含量。
Global carbon levels are currently at 380 parts per million compared to 280 before the Industrial Revolution.
全球的二氧化碳排放量已达到百万分之380超过了工业时代的百万分之280。
If the Earth reaches 800-1000 parts per million, as the worst-case scenarios predict, it’s really anybody’s guess.
如果二氧化碳的排放量达到百万分之800-1000，正如人们猜测的，那将是最坏的情况。
Hitherto diesel contained up to 500 parts per million (ppm) of sulphur, but the new rules limit sulphur to 15 ppm.
目前，柴油中硫含量为500ppm，但新规定将其限制在15ppm。
23 out of 28 products – 82 percent – contained formaldehyde at levels ranging from 54 to 610 parts per million (ppm).
28件产品中的23件 - 82% -甲醛含量在54至610百万分率(ppm)之间。
The measurement amounts to the neutrinos travelling faster than the speed of light by a fraction of 20 parts per million.
这些测量结果意味着中微子的速度要比光速快五万分之一。
Figures from a measuring station in northern Norway show that CO2 levels are increasing by 2-3 parts per million every year.
科学家们说，北极的二氧化碳水平正在以前所未有的速率上升。挪威北部一个测量站的数据表明，二氧化碳浓度正以每年百万分之2- 3的速度上升。
Gun murders are consequently rare, at just over one killing per million people per year, one of the lowest rates in the rich world.
由是英伦的枪杀案很少见，每年每百万人死于枪击的人数才刚过1人，是发达国家中枪杀率最低的国家之一。
Current methane concentrations in the Arctic average about 1.85 parts per million, the scientists said, the highest in 400,000 years.
目前在北极地区甲烷浓度平均为大约百万分之1.85，科学家们说，这是40万年中的最高水平。
A commonly cited goal is to stabilize GHG concentrations around 450-550 parts per million (PPM), or about twice pre-industrial levels.
一个共同的目标是使温室气体在空气中的浓度稳定在450- 550ppm(注二)，或者大约两倍于工业化前的水平。
350’s ultimate goal is to achieve global action to lower the concentration of carbon dioxide in the atmosphere to 350 parts per million.
350的终极目标是要把全球温室气体浓度削减至350ppm二氧化碳当量。
All the methods give the same result: the concentration of oxygen is declining everywhere at the same rate, about 20 parts per million (PPM) per year.
所有这些方法都得到了同样的结论：地球上所有地方的含氧量正在以同样的速度(大约每年0.002%)减少。
The technology is said to have an average detection rate of 96% and a low rate of false alarms: a mere five per million, according to tests by the ISO.
据说该技术的平均检出率高达96%并且虚报率低：根据ISO的测试，每一百万仅仅出现五次虚报。
Our planet has always harbored water. The rubble that coalesced to form Earth contained trace amounts—tens to hundreds of parts per million—of the stuff.
虽然地球上的岩石或多或少都含有一定量的水，但是科学家认为这些水不足以形成今天的海洋，因此他们将目光转向太空，去寻找海洋的起源。
That is still too high for many breeding operations, but work now being done by Cornell University and others should cut this to $30 per million DNA markers.
对于很多育种工作来说，这个成本仍然很高，但是康奈尔大学和其他研究机构现在从事的工作应该会大幅消减成本，每100万DNA的标记成本仅需30美元。
At 250 parts per million CO2, the shellfish grew vigorously, and at 750 PPM and higher they were crippled, feeble creatures with thin shells and weak connective tissues.
在CO2含量为百万分之250时，甲壳类生物生长得很好，而到了百万分之750或更高时，它们的甲壳变薄、连结物质变弱，成了残破而虚弱的生物。
The reason may well be climate change caused by increasing concentrations of atmospheric greenhouse gases-now roughly 390 parts per million, up from 280 PPM in the 1700s.
导致这一现象的原因可能就是大气层中温室气体浓度增加引起的气候变化，目前大气层中的温室气体浓度已经从1700年的280ppm增加到现在的390ppm (ppm意为百万分之一，大概是指体积的比)。
The reason may well be climate change caused by increasing concentrations of atmospheric greenhouse gases-now roughly 390 parts per million, up from 280 PPM in the 1700s.
导致这一现象的原因可能就是大气层中温室气体浓度增加引起的气候变化，目前大气层中的温室气体浓度已经从1700年的280ppm增加到现在的390ppm (ppm意为百万分之一，大概是指体积的比)。
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