"These difficult to reach populations frequently go underground and remain not visible to the medical delivery system,"

VOA: standard.2009.11.15

Sounds can't be seen. They are not visible, but for all that, they can be sensed.

声音看不见，但是可以感知到。

耶鲁公开课 - 死亡课程节选

It is now recombined in its very atoms, not merely in its visible and superficial parts.

它的每一个原子都重新组合,而非仅仅进行了表面的，可见的改变。

耶鲁公开课 - 1945年后的美国小说课程节选

When you want to know if something is transparent to visible light or not, here is the mystery material and here is visible light.

而我们知道,物体是否对可见光透明，这里是神秘的材料，这里是可见光。

麻省理工公开课 - 固态化学导论课程节选

When they're through and had reached their peak, their notion of monarchy is something fit for barbarians, but not for Greeks. A free man may not live under a monarchy, and the roots of that, I think, are visible in Homer.

当他们赢得竞争,到达权利的顶峰时,他们所谓的君主制其实更适合于异邦人,而不是希腊人,君主统治下不存在自由人,这个想法的根源可以在《荷马史诗》中找到

耶鲁公开课 - 古希腊历史简介课程节选