1、It refers to both the overt and the unobservable language behaviors in communicating.
這指的是交際中顯性的和不可觀察的語言行為。

2、The concepts of decentralized controllable subspace and unobservable subspace are presented.
提出了大系統(tǒng)的分散能控子空間和分散不能觀測子空間的概念。

3、Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.
和海浪不同，波陣面或固定相平面是不能觀測和不能發(fā)現的。