parts per million

常見(jiàn)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(yáng)系外行星——或者稱為外行星——所反射的光線變化相對(duì)于其恒星的亮度只有百萬(wàn)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(wàn)分之 250 時(shí)，甲殼類(lèi)生物生長(zhǎng)得很好，而到了百萬(wàn)分之 750 或更高時(shí)，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(shí)應(yīng)該把大氣中二氧化碳的含量應(yīng)該控制在百萬(wàn)分之350個(gè)單位，目前的含量水平為百萬(wàn)分之387個(gè)單位。

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.

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