concentrations in sunlit soil might average about 1, 000 parts per million, the equivalent of roughly a quart of water per ton of material.

unless you're in a full body suit and have a fully sealed gas mask, two to three parts per million will kill you.

除非你身着全身套装并佩戴一个完全密封的防毒面具，否则仅百万分之二或三的毒气就足以将你置于死地。

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the epa regulates wastes containing 50 (parts per million) ppm pcbs and greater.

美国环保局规定的废物含有50（百万分之一），多氯联苯和百万分之多。

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until this past month, the safety standard for consumer paints was 600 parts per million.

直到上个月，消费油漆的安全标准为每百万单位含铅量600个。

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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。

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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。

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last week lord stern suggested that meeting a less stringent target (500 parts per million) would cost 2% of world gross domestic product.

上周，斯特恩爵士表示，只符合宽松些的目标（500ppm）将消耗世界国内生产总值的2%（9）。

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before the industrial revolution the air contained about 280 parts per million of carbon dioxide.

工业革命前空气中二氧化碳含量为百万分之280今天已经上升到百万分之358。

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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。

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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。

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its 95-megapixel camera, the largest ever launched into space, can detect tiny changes in a star's brightness of only 20 parts per million.

拥有迄今为止最大分辨率——0.95亿像素的太空相机，开普勒能够发现星光低至百万分之20的极微弱变动。

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and this precise oxygen concentration, 10 parts per million, that caused suspended animation, is conserved.

这一特定的氧浓度，百万分之10，可以造成假死状态，这个比例是恒定的。

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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。

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with atmospheric carbon concentrations rising towards 400 parts per million concerns about climate change will not go away.

随着大气中的碳浓度接近400ppm，人们对于气候变化的担忧将不会消失。

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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。

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ian hutcheon: if you go out on the beach and pick up a handful of sand it contains about 4 parts per million of uranium.

伊恩·哈钦：如果你在沙滩上随便抓一把沙，其中大约会含百万分之四的铀成分。

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for swimming pools using ozone for disinfection , ensure that the water should contain not less than 0. 5 parts per million of chlorine .

如泳池使用臭氧消毒，应确保池水的氯含量不少于百万分之0.

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the range is normally expressed in the same units as test results (e. g. percent parts per million) obtained by the analytical procedure.

该范围通常以与该分析规程得到的测试结果相同的单位表示，例如百分比，百万分率等。

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the sensitivity of modern analytical apparatus has lowered some detection thresholds past parts per million, down to parts per billion.

现在的分析设备的灵敏度已经降低了一些检测限，高至百万分率，低至十亿分率。

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a handful of dirt from your backyard would probably contain a smidgen, maybe a few parts per million.

你家后院里的一把泥土可能含有一点点，也许是百万分之几。

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now , the same mouse is given 80 parts per million hydrogen sulfide in this solid graph, and look what happens to its temperature .

现在，还是同样一只老鼠，同样是这个图，给空气中注入百万分之八十硫化氢，观察它的体温变化。

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