结果：牙本质经化合物沉积法处理后，其表面牙本质小管开口被结晶状物质封闭。
RESULT: The SEM pictures showed that the process formed a uniform layer covering and occluded with crystalloid substances in dentinal tubules.
天然气水合物是一种结晶状固态简单化合物。
Natural gas hydrate is a kind of simple crystalloid solid hydrate.
天然气水合物是在低温高压环境下由水分子和气体分子构成的结晶状特殊固体化和物，它主要分布于永久冻土带及浅海大陆架及深海平原沉积物中。
Natural Gas Hydrate occurs at conditions of low temperature and high pressure, it is a special solid crystal compound composed of natural gas molecule and water molecule.
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