a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.
一种重而脆的铂属金属元素，用于制合金，与铂或锇形成天然合金。
"It probably does not occur uncombined in nature But is found in natural alloys with other noble (i.e., chemically inactive or inert) metals."
自然界中可能不存在纯铱,通常和其它贵金属共生于天然合金中(化学活性不活跃或迟钝)。
Study on Synthesis of Metal-Complexed Natural Polymer Catalyst and Their Catalytic Properties;
金属配位天然高分子催化剂的合成与性能研究
One-Step Synthesis of Gold Nanostructures by Polysaccharides;
一步合成天然多糖诱导的金纳米结构材料
Raman and PL Spectra Studies of Natural and HPHT Synthetic Diamonds
天然与高温高压合成金刚石的RAMAN与PL光谱研究
Development of polycrystalline diamond composite and its drilling bit for oil and gas
金刚石复合片及其石油、天然气钻头发展概况
Some metals, such as gold, are found in their native state---that is, uncomBined with other dements.
有些金属，如黄金，是以天然状态存在的，即不与其他元素化合。
A Study of Cermets by In-Situ Synthesis from Natural Ilemenite;
天然钛铁矿碳热、铝热原位合成金属基复合陶瓷的研究
Catalytic Performance of Natural Polymermetal Complexes for Asymmetric Hydration and Heck Reaction
天然高分子金属络合物在不对称水合及Heck反应催化性能的研究
insert natural diamond bit
天然金刚石镶齿钻头
inorganic carbonate of metals (excl, neutral sodium carbonate, natural carbonates and double or complex carbonates)
无机金属碳酸盐（不包括中性碳酸钠、天然碳酸盐和复或综合碳酸盐）
Although the causes of idiopathic Parkinson's disease remain a mystery, there are other forms of Parkinson's disease.
虽然造成先天性帕金森氏综合症的病因还是个谜，
Preparation of Poly Acrylic Acid System/Nonmetal Minerals Superabsorbent Composite by UV Photoinitiation;
紫外光引发制备聚丙烯酸系/天然非金属矿物高吸水性复合材料
Study of the Interaction of Native DNA and Nucleotides with Compounds of Germanium;
金属锗化合物与天然DNA及单核苷酸相互作用的研究
Preparation and Catalytic Activity of Natural Polymer Supported Quasi-Porphyrin Metal Complexes
天然高分子担载类卟啉金属配合物的制备及催化性能研究
Comparison of Spatial Structure for Natural and Semi-natural Mixed Forests in Jingouling Forestry Farm,Jilin Province of China
金沟岭天然和半天然混交林林分空间结构比较
a natural pearl; natural deposits of potassium salts; natural resources; natural fibers; natural blonde hair; the natural color of raw silk.
天然珍珠；钾盐的自然沉淀物；自然资源；天然纤维；天生的金发；生丝的天然色彩。
marine natural organic compounds
海洋天然有机化合物