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1·He has worked at the coal face for eight hours.

这矿工在工作面上已经干了八小时了。

2·Two models for output of mechanized coal face are constructed with Markovian theory.

利用马尔可夫理论，构造了两个机采工作面产量的模拟模型。

3·The safe monitoring system on the coal face is the nerve of safe production in coal mine.

综采工作面的安全监测系统是煤矿生产的神经系统。

4·Duct monitoring system is an effective means to predict the trends of spontaneous combustion in coal face.

束管监测系统是预报采煤工作面自然发火趋势的有效手段。

5·The in-situ practices show that most rock bursts occur in the front abutment scope ahead of the coal face.

现场实践表明，大多数冲击地压发生在工作面煤壁前方超前支承压力范围内。

6·The safe production in coal face is directly influenced by the low pressure sealing quality of hydraulic props.

单体液压支柱低压密封质量，直接影响到工作面安全生产。

7·The field investigations show that ground pressure of coal face with high productivity depends on face advance rate.

通过现场实测，得出了对浅埋煤层高产高效工作面顶板来压特征和不同推进速度的矿压显现规律。

8·Analyzing the accident of the type and reason in blast mining top-coal face, and preventative measures are provided.

分析了炮采工作面顶板事故的类型及产生原因，提出了预防措施。

9·The practices prove that the presented technology can assure the safety and high production efficiency of the coal face.

实践证明，这套技术安全、可靠、有效，能够保证在工作面进行高效生产。

10·Why lose a hard-working 25-year-old for a couple of years when you can train him internally and keep him at the coal face?

为什么要让一个积极进取的、25岁的年轻人浪费几年的光阴（去读MBA)？ 而在此期间通过内部培训将使其显露才干。