| Chinese | English |
| 美国国家天然气管道安全法案 | Natural Gas Pipeline Safety Act |
| 国际天然气汽车协会 | International Association of Natural Gas Vehicles |
| 国际自然与天然资源保护联合会 | International Union for Conservation of Nature and Natural Resources |
| 天然公园 | natural park A designation of project lands which preserves natural resources for their scientific, scenic, cultural and/or educational value by limiting development and management practices. Land managed to protect rare and endangered species of flora and fauna will be designed as natural areas (通过限制发展的和经营活动，为其科学、风景、文化和/或教育价值保护自然资源而指定的项目土地。保护动植物群的稀有和濒危物种的土地将被设计为自然风景区。) |
| 天然放射性 | natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. (辐射主要归因于铀，其少量出现在一些岩石、土壤，建筑材料等里面。) |
| 天然材料 | natural material No definition needed (无需定义。) |
| 天然林 | natural forest A forest area that has developed free from the influence of humans and remains largely unaffected by their activities. The natural forest may include, but is not necessarily equivalent to, an old-growth forest (摆脱人类影响的林地，其活动在很大程度上不会受到影响。天然林可能包括，但不一定等同老龄林。) |
| 天然煤气 | natural gas |
| 天然气 | natural gas A natural fuel containing methane and hydrocarbons that occurs in certain geologic formations (含有甲烷和碳氢化合物的天然燃料，在特定的地质结构中产生。) |
| 天然气勘查 | natural gas exploration Underground prospection conducted with various methods to discover natural gas deposits which are usually found in the immediate vicinity of crude petroleum (地下勘探与多种方法进行发现的天然气储量，通常在原油附近发现。) |
| 天然气发动机 | gas engine An internal combustion engine that uses gaseous fuel (使用气体燃料的内燃机。) |
| 天然气安全管理条例 | Gas Safety Management Regulations |
| 天然气开采 | natural gas extraction The tapping of natural gas from wells located under the sea and in general from underground sources often in association with petroleum deposits; it is used as a fuel, having largely replaced coal-gas for this purpose, and as a source of intermediates for organic synthesis (海下气井和地下天然气的开采一般都与石油矿床有关，它作为燃料被使用，为此在很大程度上取代煤气，以及作为有机合成中间体源。) |
| 天然气汽车 | natural gas vehicle |
| 天然气汽车同盟 | Natural Gas Vehicle Coalition |
| 天然气汽车规划 | National Gas Vehicles Program |
| 天然气管道 | gas pipeline A long pipe, especially underground, used to transport gas over long distances (长管道，尤其是地下，用于长途运输天然气。) |
| 天然石 | natural stone A gemstone that occurs in nature, as distinguished from a man-made substitute (自然出现的宝石，区别于人造替代物。) |
| 天然纤维 | natural fibre A textile fiber of mineral, plant or animal origin (源自矿物、植物或动物的纤维。) |
| 天然纪念物 | natural monument A natural/cultural feature which is of outstanding or unique value because of its inherent rarity, representative of aesthetic qualities or cultural significance. Guidance for selection of a natural monument is: 1. The area should contain one or more features of outstanding significance (appropriate natural features include spectacular waterfalls, caves, craters, fossil beds, sand dunes and marine features, along with unique or representative fauna and flora; associated cultural features might include cave dwellings, cliff-top forts, archaeological sites, or natural sites which have heritage significance to indigenous peoples).; 2. The area should be large enough to protect the integrity of the feature and its immediately related surroundings (因为它内在的稀有性、审美质量或者文化意义上的代表性而具有杰出或者独特价值的一个自然/文化特征。 对一座天然纪念物选择的指导是： a.此地区应该包含一个或更多杰出意义的特点(合适的自然特征包括壮观的瀑布、山洞，火山口、化石层、沙丘和海，伴随独特或者有代表性的动植物群；相关的文化特征可以包括对当地人有遗产意义的窑洞、悬崖堡垒、考古遗址或者自然场所); b.地区应该大得足以保护其特征和紧密相关的环境的完整性。) |
| 天然肥料 | natural fertiliser Organic material added to the soil to supply chemical elements needed for plant nutrition (有机物质添加到土壤中以供应植物营养所需的化学元素。) |
| 美国得克萨斯州天然资源保护委员会 | Texas Natural Resources Conservation Commission |
| 液化天然气 | gas liquefaction Conversion of a gas to the liquid phase by cooling or compression (通过冷却或压缩把气体转化为液相。) |
| 清洁天然气车 | clean natural gas vehicle |
| 火灾和天然气测控系统 | fire and gas detection and control system |
| 石油天然气保护委员会 | Oil and Gas Conservation Commission |
| 美国阿拉斯加石油天然气资源保护委员会 | Alaska oil & Gas Conservation Commission |
