Airplanes follow an invisible map of highways and avenues in the sky in order to make it to their destinations.

为了到达目的地，飞机在空中也按照地图飞行，这种地图上面布满了看不见的公路和街道。

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But as habit and convenience make us more and more reliant on the web, the off-the-web archive doesn't just seem hard to find, it becomes effectively invisible.

但是因为习惯和便利性我们总是越来越依赖web，离线的归档资料看起来也不是很难找，也正更有效地呈现出来。

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If your child is afraid of monsters, then help her make an invisible potion of "monster -vanishing dust" and sprinkle it on the road.

如果你的孩子惧怕怪物，那就帮助她制造一剂无形的“怪兽消失粉”，并把它洒在道路上。

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Given the frequency of invisible promotions and their potential negative consequences it might make sense for you to periodically look at your own job to assess unrecognized scope changes.

FORBES: Are You The Victim Of An Invisible Promotion?

They think the universe is stuffed with invisible dark matter composed of particles very different from the ones that make up visible matter, and it is the gravity of this dark matter that holds galaxies together.

ECONOMIST: Spotting dark matter, at last