In recent years, sand excavation optionally at river bed has brought trouble to some Bridges.
近年来河道大量无序采沙对大桥安全带来了隐患。
The development of Coal bed Methane (CBM) has made greater progress in recent years.
近年来,煤层气开发取得了较大进展。
The development of Coal bed Methane (CBM) has made greater progress in recent years.
近年来,煤层气开发取得了较大进展。
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