片语

defective parts per million缺陷零件每百万分之几

parts per million range百万分之几级

M Parts per million百万分之

defect parts per million百万分之不良品数

parts per million concentrationppm浓度

parts s per million百万分率

equivalent parts per million毫克当量

parts w per million百万分之一

英汉例句

• experiments she conducted in hawaii show reefs will dissolve 48 percent faster when the level of co2 in the atmosphere jumps from 400 parts per million to 750 ppm.

  她在夏威夷主导的实验显示，当大气中二氧化碳含量从千分之零点四上涨到千分之零点七五时，珊瑚礁的溶解速度将会加快百分之四十八。

• one group ate food with 0.3 parts per million (ppm) methylmercury, which most u.

  第一组吃的食物中，甲基水银含量是千万分之三。

• uranium is usually extracted from ore that contains 1, 000 or more parts per million (ppm) of the element.

  铀通常是从铀含量在百万分之一千以上（1000ppm）的铀矿中提炼出来。

• 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。

• it is believed that atmospheric carbon-dioxide concentrations have increased from about 280 parts per million to around 370 parts per million since the start of the industrial revolution.

  人们认为，大气中的二氧化碳浓度已经从工业革命开始时的280ppm左右增加到了大约370ppm。

• however, none of the melamine concentrations in the eggs exceeded the fda「s maximum allowable level -- 2.5 parts per million (ppm) in foods.

  然而，所产鸡蛋中的三聚氰胺含量都没有超过美国食品与药物管理局设置的最高允许水平——食品中含2.5ppm的三聚氰胺。

• today, we」re at 385 parts per million and rising.

  现在大气中的二氧化碳含量是385ppm，而且还在上升。

• current concentrations of this dominant greenhouse gas have reached 390 parts per million -- up from 280 ppm in recent pre-industrial times -- and scientists tracking this buildup see no end in sight.

  现今这种主要温室气体的浓度已经达到百万分之三百九十--高于工业化时代前的百万分之二百八十--并且科学家认为现阶段这个数字还将继续上涨。

• research by 17 scientists published in the december 14, 2007 issue of science suggests the tipping point for coral reefs would be co2 concentrations of 450 parts per million in the atmosphere.

  2007年12月14日《科学》杂志刊登的由17位科学家共同撰写的研究报告表明，珊瑚礁能够生存的极限点是空气中二氧化碳的浓度为百万分之四百五十（450ppm）。

• 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。

• and toxins where high doses of thousands of parts per million can kill you.

  第三类是那些数千ppm的剂量可以杀人的毒素。

• 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。

• 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。

• one group ate food with 0.3? parts per million (ppm) methylmercury, which most u.s. states would regard as too high for human consumption.

  一组的食物含千万份之三的甲基水银，这个含量在美国大多数州都被认为是超出人体承受的。