在这个阶段，牙齿可以借助唾液中的氟化物和矿物质修复脆弱的部位。
At this stage, the tooth can repair the weakened area with the help of fluoride and minerals in saliva.
选牙膏的时候要确保它含有氟化物。
When you're choosing a kind of toothpaste, make sure it has fluoride.
因此，非法进口氯氟化碳的黑市已经扩大。
Consequently, a black market in imported illicit CFC's has grown.
在氟化钾催化下，芳香醛与氰乙酸乙酯发生克脑文格尔缩合反应，得到高产率的缩合产物。
The knoevenagel condensation of aromatic aldehydes with ethyl cyanoacetate proceeds smoothly in the presence of potassium fluoride giving products in high yield.
铍二氟化物极易溶于水，与其它碱土不同。
Beryllium difluoride is very soluble in water, unlike the other alkaline earths.
而用氟化物漱口则能够使其坚固。
现在DEC盐里面还有碘和氟化物。
330千伏的六氟化硫断路器。
我应该给孩子氟化添加物吗？
你的牙科保健里需要包括氟化物处理和窝沟封闭术吗？
Should your dental care include fluoride treatments or dental sealants?
在1955年，瑞士开始向盐中添加氟化物，以防止龋齿。
In 1955, Switzerland began adding fluoride to its salt to prevent dental cavities.
这个系统，由林德集团制造，能将氟化氢分解成氟气。
The system, made by Linde, splits hydrogen fluoride into fluorine.
普莱瑟说我们现在应当密切关注大气中的三氟化氮含量。
Prather says we should now be following nitrogen trifluoride concentrations in the atmosphere closely.
他发现2006年中有大约563公吨的三氟化氮被排放。
He found that about 563 metric tons of nitrogen trifluoride was emitted in 2006.
随后不久发现了在牙膏中添加氟和氟化物可以加强牙釉质抵御腐蚀。
This was soon followed by the discovery that the addition of fluoride and fluoride compounds to toothpaste would strengthen tooth enamel against decay.
很可能氪和氩也可以做路易斯碱，但显然它们不能和氟化氢竞争。
It is possible that Kr and Ar could also act as Lewis bases, but evidently they cannot compete with HF.
空气化工产品公司宣称全球的三氟化氮产量已经达到7300公吨。
Air Products claims that worldwide production of nitrogen trifluoride has reached 7, 300 metric tons.
三氟化氮(NF 3)主要被半导体工业用于清洗制造硅芯片的工作舱。
Nitrogen trifluoride (NF3) is used mainly by the semiconductor industry to clean the Chambers in which silicon chips are made.
在世界许多地区，包括非洲、东地中海和南亚，氟化物浓度都有升高趋势。
Fluoride occurs at elevated concentrations in many areas of the world including Africa, the Eastern Mediterranean and southern Asia.
可从加氟饮用水、盐、牛奶、嗽口水或牙膏以及专业用氟化物获得氟化物。
Fluoride can be obtained from fluoridated drinking water, salt, milk, mouth rinse or toothpaste, as well as from professionally-applied fluorides.
当我们认识到氟化物可以大显身手是，我们开始在饮用水、牙膏和漱口水里加氟。
When we realized that fluoride could help, we put it in our drinking water, our toothpaste and our mouthwash.
德国的科学家利用X射线光电光谱得到了牙齿在氟化物处理后的表面细节图像。
Scientists in Germany used X-ray photoelectron spectroscopy to get a detailed image of the surface of a treated tooth.
美国牙医协会(ada)建议给不具备最佳饮用含氟水的社区中的儿童补充氟化物。
The American Dental Association (ADA) recommends fluoride supplements for children who live in communities that don't have optimally fluoridated drinking water.
这样能使能量消耗比使用三氟化氮时更少，而且没有促进全球变暖的危险，皮尔格林说。
That takes less energy than splitting nitrogen fluoride and there is no global warming risk, Pilgrim says.
而且在这些当中有些你或许认识，是二氯二氟化碳，它也是众所周知的氟利昂。
And, this one here, some of you might recognize, is dichlorodifluoromethane. It's also known as a CFC.
在稀有气体一阶电离势的基础上，科塞尔注意到：氙最可能形成氟化物和氧化物。
On the basis of the first ionization potentials of the gases, Kossel noted that xenon was most likely to have the capability of forming fluorides and oxides.
也许这样一来，就能够发现过量的氯氟化碳(如果外星人也使用头发定型剂的话)。
Or maybe finding excessive chlorofluorocarbons (if the aliens all use hairspray).
大气中三氟化氮的浓度大约为0.5万亿分之一(ppt)，使得它很难测定。
The concentration of nitrogen trifluoride in the atmosphere is about 0.5 part per trillion, making it very hard to measure.
大气中三氟化氮的浓度大约为0.5万亿分之一(ppt)，使得它很难测定。
The concentration of nitrogen trifluoride in the atmosphere is about 0.5 part per trillion, making it very hard to measure.
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