大部分结晶岩石都非常坚硬，但也有例外，最常见的就是玄武岩，它是一种火山岩浆凝固后的形态，内部充满了微小的气泡，因此也具有多孔渗水的特点。
Most crystalline rocks are much more solid; a common exception is basalt, a form of solidified volcanic lava, which is sometimes full of tiny bubbles that make it very porous.
他使盐结晶作为他的实验的一部分。
当地球冷却和结晶的时候，来自火山的气体到达地球表面，其中的蒸汽可能已经形成了海洋的大部分。
As the Earth has cooled and crystallised, there were gases from volcanoes coming to the surface and the steam from them has probably formed the majority of the oceans.
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