Dentin is pretty hard, but unlike enamel, it's porous.

牙本质非常硬，但与牙釉质不同，它是孔。

These are porous molecular networks through which air can circulate. Their porosity gives them a huge surface area.

这些是孔分子网络，空气以通过它循环。它孔性使它具有很大表面积。

You see, my city is built on porous limestone rock, and the water will just come up through it.

你看，我城市建在孔石灰岩上，水会从这里涌上来。

The reason for this is that, like many other porous materials, fresh snow is very good at absorbing sound.

原因是，像许其他孔材料，新鲜雪很容易吸收声音。

Waves of stone, floating on sea foam all because the glass is porous.

漂浮在海面上石头波浪，因为玻璃是孔渗透。

That porous material that was the bone got filled in with little spheres, opal, basically.

骨头孔材料被填充了小球体，基本上是蛋白石。

Bones might seem rock-solid, but they’re actually quite porous inside.

骨头能看起来坚如磐石， 但实际上它内部是孔。

[Derek] So water doesn't make soil slipperier, but soil is porous.

- [Derek] 所以水不会使土壤变得更滑，但土壤是孔。

There, carved in the smooth, porous stone, was the dark image of a man's face.

在那里，在光滑、孔石头上雕刻着一张男人黑脸。

You know, plenty of porous basalt rock in a geothermally active zone is one such example.

你知道，地热活跃带中大量孔玄武岩就是这样例子。

To absorb sunlight, M.I.T. researchers created a porous disc of graphite flakes.

为了吸收阳光，麻省理工学院研究人员制造了一个孔渗水石墨薄片圆盘。

Thawed tofu has a porous resilience that soaks up sauce, making it perfect for stews.

解冻后豆腐孔、有弹性，能吸收酱汁，非常适合炖煮。

Their porous leaves purify the air by trapping carbon and other pollutants, making them essential in the fight against climate change.

它那孔叶子通过捕获碳和其他污染物来净化空气，从而使其在应对气候变化时起到了至关重要作用。

That water vapor wafts through a porous membrane made from plastic.

水蒸气飘过塑料制成孔膜。

Rain sinks through the porous limestone down to groundwater levels, and consequently, no river runs through the land.

雨水通过孔石灰石下沉到地下水位，因此没有河流流经这片土地。

Carl fingered the blue-green leaves, porous like blotting-paper and shaped like birch leaves, hung on waxen red stems.

卡尔用手指抚摸着蓝绿色叶子， 孔像吸墨纸， 形状像桦树叶， 挂在蜡红色茎上。

Groundwater sourced near porous rocks, for example, will contain more minerals, while water from glaciers has almost none.

例如，来自孔岩石附近地下水将含有更矿物质，而冰川融水几乎没有矿物质。

Porous pots like unglazed terra cotta might be better idea for wet climates.

像未上釉陶土这样孔盆能更适合潮湿气候。

The new device contains a porous crystal called a metal organic framework that soaks up water vapor like a sponge.

这种新设备包含一种称为金属有机框架孔晶体，它以像海绵一样吸收水蒸气。

They all have a dense, smooth-looking external layer of compact, or cortical bone around a porous, honeycomb-looking area of spongy bone.

它都有致密、光滑外层致密或皮质骨，围绕着孔、蜂窝状海绵骨区域。