二氧化氮

Even though CFCs and nitrous oxide both destroy ozone, they actually work against each other.

即使碳氟化合物和一氧化二氮都会破坏臭氧层，他们彼此间还相互作用。

The scientists say that nitrous oxide, not CFCs, are now the biggest threat to the ozone layer.

这位科学家还说，现在，一氧化二氮才是臭氧层最大的威胁，而不是碳氟化合物。

So less CFCs means that each remaining molecule of nitrous oxide will destroy more ozone.

所以如果碳氟化合物少了，那么剩余下来的一氧化二氮分子会破坏更多的臭氧。

With HZSM-5, nitration of chlorobenzene by N2 05 has been investigated.

本文研究了在HZSM-5分子筛催化下，五氧化二氮对氯苯的硝化反应。

Using 2,4,6-〓 as phase-transfer catalyst, ten symmetrical azobenzene were prepared with a saturated solution of potassium ferricyanide in 2N aqueous potassium hydroxide and dichloromethane.

用2，4，6-三叔丁基苯酚为相转移催化剂，芳胺类化合物在饱和铁氰化钾的氢氧化钾溶液和二氯甲烷的两相转移催化下合成了10个对称取代偶氮苯，并对反应机理也做了合理的解释。

This paper put forward three ways: Oxidation-reduction titration, ferruginous spectrophotometry, and direct spectrophotometry. Every way is applied in PH fit for itself. Every way should pay attention to some ways.

本论文确定高铁酸钾的三种定量分析方法：亚砷酸钠氧化还原滴定法、邻二氮杂菲分光光度法、直接分光光度法，并明确了每种方法的适用PH值范围和应遵守的相应注意事项。

The effort of spray characteristic on rocket engine combustion stability for hypergolic propellant was studied.

用数值方法研究了一甲基肼/四氧化二氮自燃推进剂喷雾液滴直径对火箭发动机燃烧稳定性的影响。

In the chair at the dentist's office, nitrous oxide is better known as "laughing gas"—it's used to knock out patients during uncomfortable procedures.

在牙医办公室的椅子上，一氧化二氮气体被认为是"笑气"——在令人不舒服的过程中，它被用来麻醉患者。

Nitrous oxide is commonly known as laughing gas.

一氧化二氮通常被称作笑气。

Objectives To detect the methylation of P15(superscript INK4B) gene in patients with myelodysplastic syndromes and to investigate the demethylating effects of decitabine and arsenic trioxide (As2O3). Methods The bone marron mononuclear cells from 14 MDS patients were collected.

目的 检测骨髓增生异常综合征患者P15(上标 INK4B)基因甲基化状况；探讨5-氮杂－2'-脱氧胞嘧啶和三氧化二砷(As2O3)对MDS患者细胞的去甲基化作用。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷