For truly mastering a subject-area or skill there simply is no substitute for putting in the time to review and practice.
要想真正掌握某一专业知识或技能，就要花时间进行复习和练习，此外别无选择。
Mining the ore in pillars above the mine-out area comes down to the security of production, mining methods and putting in practice.
采空区上部预留矿柱的回采工作影响到整个矿山的安全生产、采矿方法及其实施。
Mining the ore in pillars above the mine-out area comes down to the security of production, mining methods and putting in practice.
采空区上部预留矿柱的回采工作影响到整个矿山的安全生产、采矿方法及其实施。
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