1、nitrogen-oxide emissions during the cruising portions of the flight fell by around a quarter.(飛行中巡航部分的氮氧化物的排放量下降了四分之一左右。)
2、Agricultural run-off and pollution from power plants are adding extranitrogen to many bogs in North America.(農(nóng)業(yè)排水和來自發(fā)電廠的污染給北美的許多沼澤增加了額外的氮。)
3、Sincenitrogen 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.(由于氮占我們呼吸的空氣的五分之四，他們對提高火星的溫度持驚人的樂觀態(tài)度，相信這可以在一百年內(nèi)完成。)
4、A third is certain basic chemicals such as carbon, oxygen andnitrogen.(第三種是某些基本的化學(xué)物質(zhì)，如碳、氧和氮。)
5、You said that thenitrogen cycle is also an important nutrient cycle.(你說了，氮循環(huán)也是一個重要的營養(yǎng)循環(huán)。)
6、A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen andnitrogen are removed from air, but its importance had not been realized.(早在一個世紀(jì)以前，亨利·卡文迪什就注意到：當(dāng)氧和氮從空氣中除去時，會有殘余氣體存在；但人們還沒有認(rèn)識到這些殘余氣體的重要性。)
7、Evennitrogen, which is a gas in its elemental state, is normally absorbed from the soil as nitrate ions.(即使是元素狀態(tài)為氣體的氮，也通常作為硝酸根離子從土壤中被吸收。)
8、Soils are most commonly deficient innitrogen and phosphorus.(土壤最經(jīng)常缺乏氮和磷。)
9、Plankton generally thrive in areas of the ocean with sufficient concentrations of certainnitrogen compounds near the surface, where plankton live.(浮游生物通常在海洋表面附近某些含氮化合物濃度足夠高的區(qū)域大量繁殖，而海洋表面正是浮游生物生存的地方。)
10、The faeces containnitrogen which fertilizes the soil.(排泄物含有肥沃土壤的氮。)
11、There's just not a substantial amount of it there, like there is withnitrogen, it's a very minimal quantity.(在那里它沒有很大的量，就像氮一樣，它的含量非常少。)
12、nitrogen is one of the byproducts.(氮就是其中的一個副產(chǎn)品。)
13、Before letting its leaves go, the tree dismantles their chlorophyll molecules and ships their valuablenitrogen back into the twigs.(在樹葉凋落之前，樹會分解葉綠素分子，把有用的氮運回樹枝中。)
14、Carnivorous plants are so finely tuned to low levels ofnitrogen that this extra fertilizer is overloading their systems, and they eventually burn themselves out and die.(肉食性植物能很好地適應(yīng)低濃度氮，因此這些額外的肥料會使它們的系統(tǒng)負(fù)擔(dān)過重，最終它們會被壓垮并死亡。)
15、nitrogen dioxide is a pollutant emitted by automobiles.(二氧化氮是汽車排放的一種污染物。)
16、These pollutants are called aerosols and they include soot as well as compounds ofnitrogen and sulfur and other stuff into the air.(這些污染物被稱為氣溶膠，它們包括煤煙以及空氣中氮、硫和其他物質(zhì)的混合物。)
17、Carnivorous plants instead drawnitrogen, phosphorus, and other critical nutrients from their prey in order to build light-harvesting enzymes.(相反，食肉植物從它們的獵物那里吸收氮、磷和其他重要的營養(yǎng)物質(zhì)，以制造聚光酶。)
18、nitrogen is an unstable element.(氮是一種不穩(wěn)定的元素。)
19、Compounds ofnitrogen and sulphur dioxide should be particularly closely watched.(應(yīng)特別密切注意氮和二氧化硫的化合物。)
20、Horse waste is rich in phosphorus and alsonitrogen compared to normal soil.(和普通土壤相比，馬糞更富含磷和氮。)
21、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.(主要的差別是，相比于太陽，阿連德隕石缺失了大部分的揮發(fā)性元素，例如氫、碳、氧、氮和稀有氣體。)
22、The conditions for acquiring and retaining a thicknitrogen atmosphere are now readily understood.(現(xiàn)在很容易了解獲得和保持厚氮大氣的條件。)
23、Now, researchers have a way for people to measure how muchnitrogen pollution they produce—theirnitrogen footprint.(如今，研究人員為人們提供了一種測量個人產(chǎn)生的氮污染量的辦法——他們的氮足跡。)
24、The poor soil of bogs, for example, offers littlenitrogen and phosphorus, so carnivorous plants enjoy an advantage over plants that obtain these nutrients by more conventional means.(例如，沼澤貧瘠的土壤提供的氮和磷很少，所以肉食植物比那些通過更傳統(tǒng)的方式獲得這些營養(yǎng)的植物更有優(yōu)勢。) Hao86.com
25、The tanker was carrying liquidnitrogen.(油輪那時正在運送液態(tài)氮。)
26、The three most important nutrient recycles are thenitrogen cycle, the carbon cycle and the one we are going to talk about today, the Phosphorus cycle.(這三種最重要的營養(yǎng)循環(huán)包括氮循環(huán)、碳循環(huán)和我們今天要講的磷循環(huán)。)
27、We look at soil chemistry—for example, how muchnitrogen or magnesium there is in the soil in one spot—and we compare it with the chemistry of the soil a short distance away.(我們會觀察土壤的化學(xué)性質(zhì)——比如某個地方的土壤里有多少氮或者鎂——然后與附近土壤的化學(xué)性質(zhì)作比較。)
28、The plant requiresnitrogen in order to make proteins.(植物需要氮以制造蛋白質(zhì)。)
29、Some areas, though rich in thesenitrogen compounds, have few plankton.(有些地區(qū)雖然富含氮化合物，但浮游生物卻很少。)
30、Above all, they will have to discover how muchnitrogen it possesses.(最重要的是，他們必須搞清楚這里面含有多少氮。)
