The lithofacies method needs certain experience to judge the non-crystalline solids contents.
岩相法需要一定的经验来判断；
Although metals are crystalline solids, this is not immediately apparent when they are examined under a microscope.
虽然金属都是晶体组成的固体，但是在显微镜下观察时，这并不是一目了然的。
Semiconductor: Class of crystalline solids with electrical conductivity between that of a conductor and an insulator.
半导体：一类晶体材料，其电导率介于导体和绝缘体之间。
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