This pore space is known as porosity and is expressed as a percentage of the total rock volume.

这个孔隙空间被称为孔隙度，用岩石总体积的百分比表示。

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Parties were able to elude each other for the space of half an hour without going beyond the known ground.

在半小时的时间里，双方都能避开对方，而不会迷路。

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The proportion of empty space in a rock is known as its porosity.

岩石中空隙的比例被称为孔隙度。

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Jim Tedder tells us more. VSA hired the well-known building designer Michael Graves to design the "Revealing Culture" exhibit space.

VOA: special.2010.07.09

For example, many street corners in Paris,France show the work of an artist known as Space Invader.

VOA: special.2009.04.08

When they get to the International Space Station, the Endeavour crew will be delivering and installing a module known as Tranquility, which will provide additional room for crew members.

VOA: standard.2010.02.08

Despite the early financial support from wealthy investors and the backing of well-known space-exploration researchers, Planetary Resources faces many technical questions and uncertainties about costs and the technology required to extract materials from asteroids.

WSJ: Planetary's Plan to Mine an Asteroid

The results suggest the meteor belongs to a well known family of space rocks - known as the Apollo asteroids - that cross Earth's orbit.

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"But our concerns with Iran's development of space launch vehicle technologies are obviously well-known: Any space launch vehicle capable of placing an object in orbit is directly relevant to the development of long-range ballistic missiles, " she told reporters.

CNN: Reports: Monkey soars from Iran into space -- and back