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
Tell me about your educational background.
告诉我你的学习背景。
Silverwind took a firm grasp of his axe.
银风紧握住斧柄。
I accept that we are equals,
我认为我和他们是平等的。