A third is certain basic chemicals such as carbon, oxygen and nitrogen.
第三种是某些基本的化学物质，如碳、氧和氮。
Oxygen and nitrogen are gases.
氧和氮都是气体。
Air contains oxygen and nitrogen.
空气含有氧和氮。
What about between the carbon and nitrogen?
那么碳和氮之间呢？
Magnesium is able to burn in carbon dioxide and nitrogen.
镁是可以在二氧化碳和氮气中燃烧的。
And nitrogen is one of those and in fact it's an essential nutrient.
氮就是这些物质之一，事实上它是一种主要的营养物质。
The influence of sulfur and nitrogen in the base stocks was also studied.
同时对基础油中硫、氮对油品清净性的影响进行了讨论。
Oxygen, carbon dioxide, and nitrogen are essential for animal and plant life.
氧、二氧化碳、氮是动植物生命所必需的。
Air is made up of three main types of gases: oxygen, carbon dioxide, and nitrogen.
空气是成立的三种主要类型的气体：氧，二氧化碳和氮。
The sample flow was stopped and nitrogen was passed as carrier gas through the column.
停止样品流动，氮气作为载气通过该柱。
For example, we can talk about nitrogen, and nitrogen has five valence electrons shown here.
例如，我们可以讨论氮原子，氮原子有5个价电子。
The present invention provides a technology for separating oxygen and nitrogen from air.
本发明提供一种新的从空气中获取氧气和氮气的技术。
Primary and secondary sequence of parameters is temperature, time, flow rate of hydrogen and nitrogen.
各参数对沉积速率影响的主次顺序为：沉积温度、沉积时间、氢气流量、氮气流量。
The two species seedlings respond differently to the combination of elevated temperature and nitrogen addition.
单独施氮处理也增加了两种幼苗的株高和总生物量。
And, although you think that nitrogen, I mean, it's an inert gas.
尽管你认为那是氮气，我的意思是，它是一种惰性气体。
The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen.
这颗行星有相对较薄的大气层，主要由氮气和氧气组成。
而氮呢？
Nitrogen is the most common element in the atmosphere and is harmless.
氮是最常见的元素，它无害。
Oxygen, nitrogen, and carbon dioxide are some of the gases found in the atmosphere.
氧气、氮气和二氧化碳，是在大气层中发现的一些气体。
They take nitrogen out of the air and put it in the soil.
他们从空气中提出氮并且将其送入土中。
There is a distinct relationship between net Nitrogen mineralization rate and forest type.
氮的净矿化速率与林型关系很大。
Research the law of transport and transformation of nitrogen.
研究氮的迁移及转化规律。
B: check kidney blood urea nitrogen and serum creatinine.
肾功能检查：测定血尿素氮和肌酐。
A major environmental concern is increase of nitrogen in both surface and subsurface waters.
在环境方面人们关注的一个主要问题是地表和地下水中含氮量的增加。
Evacuate the equipment and break vacuum with an inert gas, such as nitrogen.
对设备抽真空，然后充入不活泼气体，如氮。
The growth period, nitrogen fixation, growth condition and other growth characteristics of nostoc. sp were studied.
摘要研究了念珠藻的生长周期、固氮特性、生长条件等生长特性。
Economical and effective control of pollution by ammonia-nitrogen waste water is a vital problem currently.
经济有效地控制氨氮废水污染是当前面临的重大课题。
The growth period, nitrogen fixation, growth condition and other growth characteristics of Nostoc. sp were studied.
研究了念珠藻的生长周期、固氮特性、生长条件等生长特性。
The growth period, nitrogen fixation, growth condition and other growth characteristics of Nostoc. sp were studied.
研究了念珠藻的生长周期、固氮特性、生长条件等生长特性。
应用推荐