The chemical grouting material has safe surface operation, and has good water plugging effect on stratums with micro cracks.

本发明地面操作安全，细微裂隙地层堵 水效果好。

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It is likely to take almost another 24 hours before all the miners and the rescue workers, who descended into the mine to supervise the operation there, are back on the surface.

所有矿工和下到矿井中监察救援行动的救援人员全部返回地面，可能还需要24个小时。

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We have only scratched the surface of what could be realized with deeper scientific investigation into its design, operation and impact on society.

在Web设计、操作及它对社会的影响力方面我们仍然只知道一些浅层次的知识，缺乏对它的深入科学研究和了解。

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Smit, which in charge of salvaging Prestige before it sank, said the operation - to pump the oil back to the surface - would cost nearly 50m euros and take several months to complete.

BBC: French sub to try patching Prestige

Divers brought it to the surface and then took it to a spot off Kent, during a "delicate" seven-hour operation.

BBC: Huge explosion as experts detonate large WWII mine