但它不同于隐形技术。隐形技术不是让飞机变得看不见，而只是减少能被雷达探测到的切面以使其难以被追踪到。

It differs from stealth technology, which does not make an aircraft invisible but reduces the cross-section available to radar, making it hard to track.

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美国发明家萨缪尔·摩尔斯看到用达盖尔照相法拍的巴黎街景里一个人都没有时，不禁大吃一惊，后来才明白是因为曝光时间过长，移动物体都变得看不见了。

Samuel Morse was astonished to learn that Daguerrotypes of streets of Paris did not show any humans, until he realized that due to the long exposure times all moving objects became invisible.

youdao

只有当有人试图进入你的泡泡时，这看不见的屏障才会变得明显。

This invisible boundary becomes apparent only when someone bumps or tries to enter your bubble.

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So we're making the unseen seen in the visualizations.

因此我们通过直观化过程,使看不见的东西变得可见。

麻省理工公开课 - 媒体、教育、市场课程节选

When he laughed, was witty, in a merry humor, one could scarce sees his eyes, and by and by, when he was serious and positive, he opened his eyes round.

当他笑时，他是睿智的，带有令人愉快的幽默，都看不见他的眼睛了，不一会儿，他变得严肃和积极了，便圆睁着眼睛。

耶鲁公开课 - 政治哲学导论课程节选