您要查找的是不是：
- Chinese researchers say overuse of nitrogen fertiliser is poisoning the country's air, soil and water, and that farmers could reduce its use without compromising crop yields, Nature reports. 据"自然"杂志报援引中国研究者报道，过度使氮肥用会致使国家空气，土壤及河流受到污染。农民可通过提高肥料利用效率确保农作物产量。
- "Corn requires nitrogen fertilisers and some of that comes on as ammonia, which is volatilised into the air," said Tilman. Tilman教授指出，“玉米需要氮肥，而部分氮肥以氨的形式出现，那是会挥发到空气中的;
- The environmental cost of groundwater from excessive use of nitrogen fertilisers was 803Yuan/hm2, occupying about 42.4% of the total environment pollution costs. 滥施氮肥的地下水环境代价为803元/hm2;约占环境污染总成本的42.;4%25
- Air consists chiefly of nitrogen. 空气主要由氮气组成。
- Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
- nitrogen fertiliser 氮肥
- The lamp is full of gaseous nitrogen. 灯里充满了气体氮。
- Nitrogen forms about 78% of the earth's atmosphere. 氮约占地球大气的百分之七十八。
- Get some more fertiliser for the garden. 给花园再多施些肥料。
- Turn Weeds and Toxic Thoughts Into Fertiliser. 把思想变成杂草和有毒化肥.
- Fertiliser nitrogen must be a sensibly used tool and not an addiction in intensive grassland management. 在集约的草地管理中，氮肥必须是合理使用的一种手段，而不是一种嗜好。
- Will you sunder nitrogen from air? 你能从空气中把氮气分离出来吗?
- Since the 1960s the amount of fertiliser used by farmers has increased sixfold, and not all of that extra nitrogen ends up in their crops. 从上个世纪60年代起，农场主们所使用的肥料数量已经翻了6倍，但是并不是所有这些额外的氮最终都进入到农作物中。
- Nitrogen is the most commonly used gas. 氮气是最常用的气体。
- Sample gas tubes are flushed with nitrogen. 采气管得用氮气吹扫。
- The main reservoir of nitrogen is the atmosphere. 氮的主要蓄存库是大气层。
- Spreading extra fertiliser or buying new machinery helps. 额外多施肥和购买新的机器才有帮助。
- What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少?
- Fast neutrons are also captured by nitrogen. 快中子也可以被氮吸收。
- Nitrogen forms four-fifths of the atmosphere. 氮气占空气的五分之四。
