However, there are serious issues, such as a waste of resource, disordered mining and environment pollution during development of coal resource.
但在煤炭资源开发过程中，尚存在着资源浪费，开发秩序混乱以及环境污染等严重问题。
Additionally, the influence of such factors as disordered medium, pumping sources and external environment on the lasing threshold is discussed.
并研究了随机介质、泵浦源以及外部环境等因素对随机激光阈值特性的影响。
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