油轮那时正在运送液态氮。
排泄物含有肥沃土壤的氮。
和普通土壤相比，马粪更富含磷和氮。
Horse waste is rich in phosphorus and also nitrogen compared to normal soil.
植物需要氮以制造蛋白质。
氮就是其中的一个副产品。
应特别密切注意氮和二氧化硫的化合物。
Compounds of nitrogen and sulphur dioxide should be particularly closely watched.
土壤最经常缺乏氮和磷。
Soils are most commonly deficient in nitrogen and phosphorus.
氮是一种不稳定的元素。
你说了，氮循环也是一个重要的营养循环。
You said that the nitrogen cycle is also an important nutrient cycle.
现在很容易了解获得和保持厚氮大气的条件。
The conditions for acquiring and retaining a thick nitrogen atmosphere are now readily understood.
第三种是某些基本的化学物质，如碳、氧和氮。
A third is certain basic chemicals such as carbon, oxygen and nitrogen.
最重要的是，他们必须搞清楚这里面含有多少氮。
Above all, they will have to discover how much nitrogen it possesses.
在那里它没有很大的量，就像氮一样，它的含量非常少。
There's just not a substantial amount of it there, like there is with nitrogen, it's a very minimal quantity.
在树叶凋落之前，树会分解叶绿素分子，把有用的氮运回树枝中。
Before letting its leaves go, the tree dismantles their chlorophyll molecules and ships their valuable nitrogen back into the twigs.
农业排水和来自发电厂的污染给北美的许多沼泽增加了额外的氮。
Agricultural run-off and pollution from power plants are adding extra nitrogen to many bogs in North America.
即使是元素状态为气体的氮，也通常作为硝酸根离子从土壤中被吸收。
Even nitrogen, which is a gas in its elemental state, is normally absorbed from the soil as nitrate ions.
这三种最重要的营养循环包括氮循环、碳循环和我们今天要讲的磷循环。
The three most important nutrient recycles are the nitrogen cycle, the carbon cycle and the one we are going to talk about today, the Phosphorus cycle.
这些污染物被称为气溶胶，它们包括煤烟以及空气中氮、硫和其他物质的混合物。
These pollutants are called aerosols and they include soot as well as compounds of nitrogen and sulfur and other stuff into the air.
这些微生物可以让土壤中植物生长所需的氮含量增加，在冬天让植物仍保持活跃。
These microbes enable the soil to have more nitrogen, which plants need to live and they remain quite active during the winter.
相反，食肉植物从它们的猎物那里吸收氮、磷和其他重要的营养物质，以制造聚光酶。
Carnivorous plants instead draw nitrogen, phosphorus, and other critical nutrients from their prey in order to build light-harvesting enzymes.
主要的差别是，相比于太阳，阿连德陨石缺失了大部分的挥发性元素，例如氢、碳、氧、氮和稀有气体。
The major difference is that Allende is depleted in the most volatile elements, like hydrogen, carbon, oxygen, nitrogen, and the noble gases, relative to the Sun.
肉食性植物能很好地适应低浓度氮，因此这些额外的肥料会使它们的系统负担过重，最终它们会被压垮并死亡。
Carnivorous plants are so finely tuned to low levels of nitrogen that this extra fertilizer is overloading their systems, and they eventually burn themselves out and die.
我们会观察土壤的化学性质——比如某个地方的土壤里有多少氮或者镁——然后与附近土壤的化学性质作比较。
We look at soil chemistry—for example, how much nitrogen or magnesium there is in the soil in one spot—and we compare it with the chemistry of the soil a short distance away.
由于氮占我们呼吸的空气的五分之四，他们对提高火星的温度持惊人的乐观态度，相信这可以在一百年内完成。
Since nitrogen is four fifths of the air we breathe, they are surprisingly optimistic about raising the temperature on Mars and believe it could be done in hundred years.
例如，沼泽贫瘠的土壤提供的氮和磷很少，所以肉食植物比那些通过更传统的方式获得这些营养的植物更有优势。
The poor soil of bogs, for example, offers little nitrogen and phosphorus, so carnivorous plants enjoy an advantage over plants that obtain these nutrients by more conventional means.
大气中含有少量一氧化二氮。
缺氮植物表现出上述的许多症状。
Nitrogen-deficient plants exhibit many of the symptoms just described.
牙医可能会给病人一氧化二氮，这样他们就不会感到疼痛。
Dentists may give patients nitrous oxide so they will not feel pain.
如今，研究人员为人们提供了一种测量个人产生的氮污染量的办法——他们的氮足迹。
Now, researchers have a way for people to measure how much nitrogen pollution they produce—their nitrogen footprint.
昆虫产生的氨比猪和家禽少，它们产生的甲烷比家畜少十倍，而产生的一氧化二氮比家畜少三百倍。
Insects produce less ammonia than pig and poultry farming, ten times less methane than livestock, and 300 times less nitrous oxide.
应用推荐