parts per million

常見例句

雙語例句

• The light reflected by the newfound extrasolar planet, or exoplanet, changed by only about 6.5 parts per million, relative to the brightness of the host star.
  這顆新發(fā)現(xiàn)的太陽系外行星——或者稱為外行星——所反射的光線變化相對于其恒星的亮度只有百萬分之6.5。
• 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 含量為百萬分之 250 時，甲殼類生物生長得很好，而到了百萬分之 750 或更高時，它們的甲殼變薄、連結(jié)物質(zhì)變?nèi)?，成了殘破而虛弱的生物?/li>
• They added that concentrations of carbon dioxide, the main greenhouse gas, should be limited to 350 parts per million of the atmosphere -- below current levels of 387 ppm.
  同時應該把大氣中二氧化碳的含量應該控制在百萬分之350個單位，目前的含量水平為百萬分之387個單位。

原聲例句

• The team found levels of lead as high as thirty-two thousand parts per million in tests on some paint samples from Ecuador.
• Breathing in two hundred parts per million of carbon monoxide will cause the first signs of poisoning.
• Twelve thousand parts per million of the gas will cause death in one to three minutes.

權威例句

• Floating sensors hold the oxygen to between 2 and 2.5 parts per million of water.
  FORBES: Muckraker
• Floating sensors hold the oxygen to between 2.0 and 2.5 parts per million of water.
  FORBES: Muckraker
• On average the amount is growing by about 2 parts per million per year.
  NPR: Greenhouse Gas Milestone; CO2 Levels Set Record
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