These substances afford useful lessons for use of room-blasting in the same condition.
为在同等条件下使用药室爆破提供了成功的经验。
The ordinary method of room-blasting is presented, and it is proved that room-blasting still has practical value to open pit provided it is reasonablely changed.
叙述了药室爆破的一般方法，并论述了通过合理改造，药室爆破在露天矿山生产中仍然具有实用价值。
The closet that they found the board in was in a room that looked as though it was used for a child. There was wallpaper with little spaceships blasting into outer space on it.
发现这块占卜板的壁橱在一个好像曾做过儿童房的卧室，墙上贴着壁纸，上面画着小小的宇宙飞船，它们正冲向外太空。
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