In recent years, whole tailings backfilling has become the main development trend for underground mining.
近年来，全尾砂充填已成为地下采矿主要的发展趋势。
This type of drill rig is also the main development trend in the field of drill rig technology and related equipment.
这种类型的钻机，也是主要的发展趋势，在这一领域的钻机技术及相关设备。
The main development trend of high voltage transmission line's protection is the line fiber optical differential protection.
光纤电流差动保护是高压线路主保护的发展趋势。
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