| 单词 | rare earth element |
| 释义 | > as lemmasrare earth element rare earth element n. any of a group of chemically similar metallic elements comprising the lanthanide series and also usually scandium and yttrium. ΚΠ 1888 Amer. Jrnl. Sci. 136 63 Passing to the rare earth elements, the ground under our feet is less secure. 1924 J. W. Mellor Comprehensive Treat. Inorg. & Theoret. Chem. V. xxxviii. 696 The four rare earth elements—dysprosium, Dy; holmium, Ho; erbium, Er; and thulium, Tm—are considered as a family or sub-group of the yttrium elements. 1958 Optima Mar. 22b/2 Thorium occurs chiefly in association with the rare-earth elements in monazite ore. 2000 Science 29 Sept. 2326/3 The separation of individual rare earth elements is a difficult process involving solvent extraction or ion exchange. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。