clearances
[k'lɪərənsɪz]
n.
清除( clearance的名词复数 );
许可;
（录用或准许接触机密以前的）审查许可;
净空;
例句:
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But I can't get to him without clearances.
但是没有证明我就没法见到他.
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The bridge and the top of the bus was only ten clearances.
桥与公共汽车车顶之间的间隙只有十厘米.
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When noise and vibration must be restricted, lower clearances are necessary.
当噪音和振动,必须加以限制, 降低许可是必要的.
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He says officials are negotiating for clearances.
来自VOA
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Pupils will be able to place the dates of the main events of the Highland Clearances in a timeline.
来自BBC
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Pupils will be introduced to the fictitious people who lived in the time of the Highland Clearances.
来自BBC