unseen

adj.

看不见的；未看见的；未事先过目的；即席的

n.

即席翻译；即席翻译的文章；

复数：unseens

1. I think some unseen bond unite us.
   我认为某种看不见的纽带联结着我们。
2. While you live in safety, consider unseen dangers.
   居安应思危。
3. 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。
4. 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。

Prokaryotes: the unseen majority. Proc Nat Acad Sci USA
Exploring Steganography: Seeing the Unseen
Exploring Steganography: Seeing the Unseen
Exploring Steganograohy: Seeing the Unseen
Using the Web to Obtain Frequencies for Unseen Bigrams
Learning to detect unseen object classes by between-class attribute transfer
Learning to detect unseen object classes by between-class attribute transfer
A subcortical pathway to the right amygdala mediating "unseen"fear
Organocatalysis lost: modern chemistry, ancient chemistry, and an unseen biosynthetic apparatus.
Nonparametric estimation of Shannon’s index of diversity when there are unseen species in sample