clearances [k'lɪərənsɪz]

以下由轻松背单词网站提供

附加级

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

But I can't get to him without clearances. 但是没有证明我就没法见到他。
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。