| Chinese | English |
| 一审二审法院 | first- and second-instance courts |
| 一氧化二氮 | laughing gas |
| 一氧化二氮 | nitrous oxide |
| 一氧化二氮 | dinitrogen monoxide |
| 三聚二缩磷酸盐或酯 | tripolyphosphates |
| 乙二胺四醋酸二钴 | dicobaltethylenediamine tetracetic acid |
| 二乙基锡 | diethyl tin |
| 二乙醇氨 | diethanolamine |
| 二元化学武器 | binary chemical weapon |
| 《二十一世纪人人享有健康》 | Health for All in the Twenty-First Century |
| 二十一世纪预防犯罪和刑事司法国际合作 | International cooperation in crime prevention and criminal justice for the twenty-first century |
| 二卤化物 | dihalide |
| 二卵双胎称为兄弟双胎 | identical twins |
| 二巯基丁二酸 | dimercaptosuccinic acid |
| 二巯基丁二酸钠 | sodium dimercaptosuccinate |
| 二巯基丙磺酸钠 | sodium dimercaptosulfonate |
| 二巯基丙醇 | dimercaptol |
| 二恶英 | dioxin |
| 二棕榈酰磷酯酰胆碱 | dipalmitoyl phosphatidyl choline |
| 二次污染物 | secondary pollutant |
| 二氢硫辛酸 | dihydrolipoic acid |
| 二氧化氮 | nitrogen peroxide |
| 二氧化氮 | nitrogen dioxide |
| 二氧化碳中和 | carbon neutral |
| 二氧化碳引起的气候变化 | CO2-induced changes |
| 二氧化碳当量 | CO2 equivalent |
| 二氧杂芑 | dioxin |
| 二氯乙烯 | dichloroethylene |
| 二氯乙烯 | ethylene dichloride |
| 二氯乙烯 | acetylene dichloride |
| 1,2-二氯乙烷 | ethylene chloride |
| 1,2-二氯乙烷 | ethylene dichloride |
| 1,2-二氯乙烷 | sym-dichloroethane |
| 1,2-二氯乙烷 | 1,2-dichloroethane |
| 二氯化乙烯 | ethylene chloride |
| 二氯化乙烯 | ethylene dichloride |
| 二氯化乙烯 | sym-dichloroethane |
| 二氯化乙烯 | 1,2-dichloroethane |
| 1,2-二溴乙烷 | ethylene bromide |
| 1,2-二溴乙烷 | ethylene dibromide |
| EDB = 1，2-二溴乙烷 | 1,2-dibromoethane |
| 1,2-二溴乙烷 | 1,2-dibromoethane |
| 二溴化乙烯 | ethylene bromide |
| 二溴化乙烯 | ethylene dibromide |
| 二溴化乙烯 | 1,2-dibromoethane |
| 二烷基过氧化物 | dialkyl peroxide |
| 二甲硫 | dimethyl sulphide |
| 二甲硫醚 | dimethyl sulphide |
| 二级医疗支援 | level II medical support |
| 二线式 | two-wire trunk |
| 二维和三维的分形特质 | fractal properties in two and three dimensions |
| 二维水深剖面 | two dimensional depth profiles |
| 二苯羟乙酸-3-喹咛环酯 | 3-quinuclidinyl benzilate |
| 二苯羟乙酸-3-喹咛环酯 | QNB |
| 二酰基过氧化物 | diacyl peroxide |
| 二阶段导数 | second derivatives |
| 五氧化二氮 | nitric anhydride |
| 五氧化二氮 | nitrogen pentoxide |
| 五氧化二氮 | dinitrogen pentoxide |
| 五溴二苯醚 | Pentabromodiphenyl ether |
| 亚洲及太平洋二十一世纪社会发展议程 | Asian and Pacific Agenda for Social Development into the Twenty-First Century |
| 修正的第二号议定书 | Amended Protocol on Prohibitions or Restrictions on the Use of Mines, Booby-traps and Other Devices |
| 修正的第二号议定书 | Amended Protocol II |
| 偿还特遣队所属装备费用问题第二阶段工作组 | phase II working group on reimbursement of Contingent-Owned equipment |
| 偿还特遣队所属装备费用问题第二阶段工作组 | Phase II Working Group on Reimbursement of Contingent-Owned Equipment |
| 六溴代二苯 | hexabromobiphenyl |
| 关于犯罪与司法：迎接二十一世纪的挑战的维也纳宣言 | Vienna Declaration on Crime and Justice: Meeting the Challenges of the Twenty-first Century |
| 分段施工的第二套方法 | incremental second approach |
| 加强亚洲及太平洋区域经济合作迈向二十一世纪德里宣言 | Delhi Declaration on Strengthening Regional Economic Cooperation in Asia and the Pacific towards the Twenty-first Century |
| 双吡啶二肟 | HLo-7 |
| 四氧化二氮 | dinitrogen tetroxide |
| 多氯二苯并呋喃 | polychlorinated dibenzo-furan |
| 多氯二苯并对二英 | polychlorinated dibenzo-p-dioxin |
| 对二甲氨基苯酚 | 4-DMAP |
| 对二甲氨基苯酚 | 4-dimethylaminophenol |
| 2000年大会第二十四届特别会议关于社会发展的进一步倡议 | Further Initiatives for Social Development of the twenty-fourth special session of the General Assembly 2000 |
| 1996年第二次联合国人类住区人居二会议关于人类住区的《人居议程》和《伊斯坦布尔宣言》 | Habitat Agenda and the Istanbul Declaration on Human Settlements of the Second United Nations Conference on Human Settlements Habitat II, 1996 |
| 1-氯-1,1-二氟乙烷 | 1,1-difluoro-1-chloroethane |
| 1-氯-1,1-二氟乙烷 | 1-chloro-1,1-difluoroethane |
| 生物多样性 和生态系统 服务政府间 科学政策平 台问题第二 次特设政府 间和多方利 益攸关者会议 | Second ad hoc intergovernmental and multi-stakeholder meeting on an intergovernmental science-policy platform on biodiversity and ecosystem services |
| 由会员国的技术和金融专家组成的第二和第三阶段工作组 | phase II and phase III working groups, made up of technical and financial experts from member states |
| 甲基膦酰二氟 | methylphosphonyl difluoridate |
| 磷酸二氢铵 | monoammonium phosphate |
| 磷酸氢二铵 | diammonium phosphate |
| 第一线和第二线保养 | first and second line maintenance |
| 第二套方法 | second approach to perform the work in smaller increments and relocate staff and functions as needed |
| 第二次世界气候会议 | Second World Climate Conference |
| 第二阶段裁武条约 | Treaty on the Further Reduction and Limitation of Strategic Offensive Arms |
| 联合国关于犯罪趋势、刑事司法制度的运作和预防犯罪战略的第二次调查研讨会 | Research Workshop on the Second United Nations Survey of Crime Trends, Operations of Criminal Justice Systems and Crime Prevention Strategies |
| 2-酮基-4-羟基戊二酸盐醛缩酶 | 2-keto-4-hydroxyglutarate aldolase |
| 酮戊二酸 | 2-ketoglutaric acid |
| 麦角酰二乙胺 | LSD |
