In order to probe into laws on formation of natural gas hydrates in porous medium, natural gas hydrates have been formed through mixtures of ice powers and quartzes in experiments.
为了探讨多孔介质中天然气水合物原位形成规律性，进行了将冰粉和石英砂混合并形成天然气水合物的实验研究。
In order to protect environment, nowadays many large and medium-sized cities in China have forbidden the use of small coal-fired boilers, which is a blow to most of bath centers.
出于环境保护要求，目前我国许多大、中城市已明令禁止使用小吨位的燃煤锅炉，这对于大多数洗浴中心来说，是一个不小的打击。
By this system various medium Beads and biological objects with size of micrometer order have been manipulated in a precision of nanometer order.
用该系统对多种微米量级的介质球和生物对象进行了微位移操纵，操纵精度可达纳米量级。
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