... level interval 水平间距 level pillar 水平矿柱 level plan 水平平面图 ...
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level-pillar 水平阶段矿柱
high-level pillar 高阶段矿柱
High level pillar mining 高阶段矿柱回采
high level pillar recovering 高阶段矿柱回采
Sub-level room-pillar with bolting 锚杆护顶分段房柱法
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Beckham, who is widely admired for his capacity to shoot free kicks, became a star in the mid-90s with Manchester United, where he played at the top level for a decade and became a pillar of the English national team.
WSJ: David Beckham Signs With PSG
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