求翻译：近年来，煤矿各项政策的有效实施，使得煤炭产量快速增长而煤矿事故指标下降。政策作用效果的研究，可为煤矿相关政策的制定提供指导和参考。是什么意思？

In recent years, the effective implementation of policies mine, making the rapid growth of coal production and coal mining accident indicators declined. The effect of policy research for coal-related policies to provide guidance and reference.

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In recent years, but the coal mine each policy effective implementation, caused the coal output fast growth the coal mine accident target to drop.The policy function effect research, may provide the instruction and the reference for the coal mine correlation policy formulation.

In recent years, the coal mines of the effective implementation of the policy, making coal production growth and decline in coal mine accident indicators. Study on the effect of the policy, can provide guidance and reference to coal-related policy development.