Unobtanium
n. 电影《阿凡达》中一种罕见的常温超导体，拥有奇特的磁场
🗣️ 情景例句
These knives are guaranteed never to go blunt.
这些刀保证不会变钝。
An empty purse frightens many friends.
曩中无分文，亲友不上门。
In spite of national differences, certain funny situations have a universal appeal.
尽管民族不同，有些滑稽的情节却能产生普遍的效果。