Then I looked down again and realized that between the first floor and the seventh floor there was nothing but empty space.

接着我又朝下看了看并意识到在第一层楼和第七层楼之间是空空如也的空间。

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According to quantum physics, empty space is not actually barren but is a boiling sea of so-called virtual particles and antiparticles constantly popping in and out of existence.

量子物理学认为，真空并不是真正是空的，而是沸腾的海洋——被称作虚粒子与反粒子的东西不停出现与消失。

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According to quantum mechanics, empty space is anything but empty. Rather, it is a roiling, seething cauldron of evanescent particles.

根据量子力学的原理，真空里绝非空无一物，它更有点像是一个滚动的、沸腾的以及由逐渐消散的粒子组成的大气锅。

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But finding new shopowners to fill empty space is increasingly difficult.

VOA: standard.2009.12.20

Then I looked down again and realized that between the first floor and the seventh floor there was nothing but empty space.

NEWYORKER: Meeting with Enrique Lihn

First-class existing buildings are priced to yield only around 5% to an all-cash buyer, says research firm Green Street Advisors. (The return they talk about is rent minus the costs of operating and maintaining the building and leasing any empty space.) But a skillfully developed new property can bag an annual cash return of up to 10% of its construction costs.

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But that is because they are mostly empty space.

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