One result of his research is known as the total time hypothesis, which simply means the amount you learn depends on the time you spend trying to learn it.

他的一项研究成果被称为“总时间假说”，即你学习的总量取决于你花在尝试学习它上的时间。

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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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The discoveries bring the total number of known extrasolar planets, or exoplanets, to 645.

这些发现使已知的太阳系外行星或系外行星总数量增至645个。

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The total of sea ice is known as the sea ice extent.

VOA: special.2009.10.27

What they have found is that about 1, 800 protein-coding genes, some 7% of the total known, show signs of having been subject to recent natural selection.

ECONOMIST: Human evolution

Green aficionados are familiar with the statistic that the sun bathes the Earth in trillions of barrels of energy (in oil equivalent terms), and less familiar with the fact that total known hydrocarbon resources are also countable in the trillions of barrels (from the oil-sands and ultra-deep-water sub-salt fields, to methane hydrates and coal, not to mention shale gas).

FORBES: Steve Forbes Is Wrong

The new bodies bring the known total of Jupiter satellites to 39, of which 31 are irregulars.

BBC: More moons for Jupiter