Controlling roof accidents and preventing the occurrence of bursting underground pressure are the priorities and difficulties to mine deeper isolated pillarface.
控制顶板事故，防范冲击矿压的发生是开采埋深较大的孤岛煤柱工作面的重点和难点。
2
And the angel of God, which went before the camp of Israel, removed and went behind them; and the pillar of the cloud went from before their face, and stood behind them.
在以色列营前行走神的使者，转到他们后边去，云柱也从他们前边转到他们后边立住。
3
As the core of staff and the pillar of family, middle-aged employees often face the turning point of their life and professional career.