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Uranium is very valuable because it is a rare element. 铀很贵重，因为它是稀有元素。
Elemental Abundance; Atomic Size; Igneous Rocks; The Volcanic Rocks; Mineralogy of Economically Important Rare Elements; Why are Mineral Properties Important? 矿物元素丰富度;原子大小;火成岩及火山岩介绍;稀有矿物及其经济价值;矿物特性?
It also supplies liquid oxygen, liquid nitrogen, acetylene, carbon dioxide, hydrogen, propane, freon,liquid ammonia,and rare element gas. 还兼营液氧、液氮、液氩、乙炔气、二氧化碳、氢气、丙烷气、氟里昂、液氨及其他高纯和稀有气体。
The professor is doing physical analysis on the rare elements. 教授正在对稀有元素进行物理分析。
A coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum. 花岗伟晶岩一种有时富含铀、钨和钽等稀有元素的粗纹理花岗岩
There are many different elements in aerosiderite,the main element are iron and nickel,and some rare element in earth. 陨铁成分很杂主要是铁和镍，还有地球少有的元素。
Liu Ruoxin and Fan Qicheng. 1990. Major element and rare element of ultra-marie xenolith in eastern China. In: Tu Guangzhi. Ed.Upper Mantle Characteristic and Dynamics of China. Beijing: Seismological Press. 刘若新;樊祺诚.;1990
It come from inferior archipelago of Pori,, contain abundant specific potter's clay, porcelain clay, kalium dioxide, sodium dioxide ,12 kinds of rare element of oxidizing calcium etc. inside. 它来自于波里尼西来群岛，内涵丰富特定的陶土、瓷土、二氧化钾、氧化钙等十二种稀有元素。
The ability of life to concentrate rare elements within itself is really quite remarkable. 生物在其体内浓缩稀少元素的能力十分显著。
A coarse-grained granite,sometimes rich in rare elements such as uranium,tungsten,and tantalum. 花岗伟晶岩一种有时富含铀、钨和钽等稀有元素的粗纹理花岗岩。
A coarse - grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum. 花岗伟晶岩一种有时富含铀、钨和钽等稀有元素的粗纹理花岗岩
The seatrace elements mineralize the scalp again by hydrating it in depth. 富含海洋微量元素可以有效促进头发深层水合作用；
Furthermore, the immiscibility can enrich rare elements to high level, which owe to the affinity of volatile like F, B, P, etc to rare elements. 还对稀有金属有高度富集作用，这主要归功于F、B、P等挥发份对稀有金属元素的亲和力。
It was in the days when motorcars were rare. 那是在汽车还罕见的时代。
In a printer, the removable type element. 印刷机上可拆卸的打印部件。
Rare mineral and rock atlas in Inner Mongolia II. 内蒙古珍矿奇石图谱2。
He's in his element when playing badminton. 他打起羽毛球来真是得心应手。
A top hat is a rare sight these days. 高顶大礼帽现在已不多见。
This heater needs a new element. 这个加热器需要一组新电阻丝。
I must admit I am very fond of collect rare book. 我得承认我很喜欢海内珍本。