adj.未看见的；即席的
I think some unseen bond unite us. 我认为某种看不见的纽带联结着我们。
If they hit any unseen obstacle they would be pitched headlong into the snow. 如果撞上任何没看见的障碍，他们就会被一头拋进雪里。
The exam consists of an essay and an unseen translation. 考试包括一篇作文和一篇即席翻译。
