Prewetting of coal seams by water infusion is an essential measure for dust control at working faces.

煤层注水预湿是采煤工作面防尘的治本措施，添加湿润剂是改善煤层注水效果的重要途径。

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ConclusionTo put the students of the middle and primary school as the objects of preventive TB treatment is an essential measure to control TB.

结论把中、小学生作为结核病预防治疗对象，是控制结核病流行的重要措施。

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Prewetting of coal seams by water infusion is an essential measure for dust control at working faces. Adding of wetting agent is an important approach for improving water infusion.

煤层注水预湿是采煤工作面防尘的治本措施，添加湿润剂是改善煤层注水效果的重要途径。

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The first was the defeat last month of a law increasing civil servants' pension contributions, an unpopular but essential measure.

ECONOMIST: Brazil: Cardoso tries again | The