保护层开采时，对被保护层的瓦斯治理是一项非常重要的工作。
When the protective coal seam is mined, the gas management on the protected coal seam is a very important job.
模拟结果可为保护层开采及被保护层卸压瓦斯抽采设计提供合理建议。
Simulation results may bring forward reasonable Suggestions for the design of protective layer mining and relief-pressure gas drainage.
保护胶像液体一样被涂上，迅速干燥，在牙面形成一层保护层。
Sealants are painted on as a liquid and quickly harden to form a shield over the tooth.
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