| 词汇 | rare-earth |
| 释义 | rare earth noun[ C or U ] NATURAL RESOURCESukus(alsorare earth element, rare earth metal) one of a group of metal chemical elements that are difficult to find in large quantities, and are important for technology and manufacturing: Rare earths are key in the manufacture of goods such as flat screen televisions and hybrid cars. a rare earth mineral/mine/mining company Examples of rare earthrare earth Rareearth minerals, as found, usually are dominated by one group or the other, depending upon which size-range best fits the structural lattice. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thirdly there is a low titanium basalt-andesite with extreme light rareearth element depletion that produced the layered pyroxenite-peridotite and associated gabbro cumulate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Many metals form trifluorides, such as iron, bismuth, the rareearth elements, and the metals in the aluminium and scandium columns of the periodic table. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In trace elements, they are typically more enriched in the light rareearth elements than mid-ocean ridge basalts. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Less common are the niobates of calcium, uranium, thorium and the rareearth elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Additionally carbonatites may be either enriched in magnetite and apatite or rareearth elements, fluorine and barium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Motorcycle alternators often use permanent magnet stators made with rareearth magnets, since they can be made smaller and lighter than other types. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When the phosphate anion is replaced by the larger vanadate anion, the tetragonal crystal system preferentially accommodates the larger light rareearth elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Rareearth elements are found in the minerals bastnsite, loparite, xenotime, and monazite in mineable quantities. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Later, it also started to extract rareearth metal oxides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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