单词	unobtainium
释义	unobtainium /ˌənəbˈtānēəm / (also unobtanium) noun informal A highly desirable material that is hypothetical, scientifically impossible, extremely rare, costly, or fictional, or has some of these properties in combination: what type of cabling are we talking about, steel, composite, unobtainium?... Indeed, the claims made for this technology sometimes make it sound like the legendary aerospace material ‘unobtainium.’ Veteran space industry analyst John Pike, director of GlobalSecurity.org, likes to joke that the required substance should be dubbed ‘unobtainium.’ But the Japanese 8mm Nambu cartridge might as well have been made of unobtainium.
随便看	zero-sum zeroth zero tolerance zero-zero zest zester zestful zestfully zestfulness zesty zeta zeta potential zetetic zetetics zetta- zettabyte zeugma zeugmatic Zeus Zeuxis ZEV Zeya River Zhangjiakou Zhanjiang Zhdanov

英语词典包含243303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。