1. A dense igneous rock that consists mainly of olivine and is a source of magnesium. 
   纯橄榄岩一种密度大的大成岩，主要由橄榄石组成，是镁的一种来源
2. A very hard, dense, even-textured, silica-bearing sedimentary rock used in whetstones. 
   均密石英岩非常坚硬，致密，结构均匀，含硅的沉积岩，用作磨石
3. A dense, homogeneous rock with constituents so fine that they cannot be seen by the naked eye. 
   隐晶岩，非显晶岩一种成分细密肉眼不能看到的致密同质岩石
4. A hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene, and olivine, and often having a glassy appearance. 
   玄武岩一种硬的、致密的、黑色的火山岩。它主要由斜长石、辉石和橄榄石组成，外表经常很光滑
5. the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene. 
   最常见的凝固火山岩，是一种致密的深灰色火成岩，纹理细密，主要由富钙的斜长石和辉石组成。

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• 1. 致密岩石
  dense fog 浓雾...dense rock 致密岩石...densification 浓缩
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